diff --git a/package.json b/package.json
index 204aa46..b15934b 100644
--- a/package.json
+++ b/package.json
@@ -24,7 +24,7 @@
   "devDependencies": {
     "@babel/core": "7.5.5",
     "@babel/node": "7.5.5",
-    "@babel/plugin-proposal-class-properties": "7.4.4",
+    "@babel/plugin-proposal-class-properties": "7.8.0",
     "@babel/plugin-transform-runtime": "7.5.5",
     "@babel/preset-env": "7.5.5",
     "babel-eslint": "10.0.2",
diff --git a/yarn.lock b/yarn.lock
index e498494..198a49c 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -26,6 +26,13 @@
   dependencies:
     "@babel/highlight" "^7.0.0"
 
+"@babel/code-frame@^7.8.0":
+  version "7.8.0"
+  resolved "https://registry.yarnpkg.com/@babel/code-frame/-/code-frame-7.8.0.tgz#8c98d4ac29d6f80f28127b1bc50970a72086c5ac"
+  integrity sha512-AN2IR/wCUYsM+PdErq6Bp3RFTXl8W0p9Nmymm7zkpsCmh+r/YYcckaCGpU8Q/mEKmST19kkGRaG42A/jxOWwBA==
+  dependencies:
+    "@babel/highlight" "^7.8.0"
+
 "@babel/core@7.5.5":
   version "7.5.5"
   resolved "https://registry.yarnpkg.com/@babel/core/-/core-7.5.5.tgz#17b2686ef0d6bc58f963dddd68ab669755582c30"
@@ -57,6 +64,16 @@
     source-map "^0.5.0"
     trim-right "^1.0.1"
 
+"@babel/generator@^7.8.0":
+  version "7.8.0"
+  resolved "https://registry.yarnpkg.com/@babel/generator/-/generator-7.8.0.tgz#40a1244677be58ffdc5cd01e22634cd1d5b29edf"
+  integrity sha512-2Lp2e02CV2C7j/H4n4D9YvsvdhPVVg9GDIamr6Tu4tU35mL3mzOrzl1lZ8ZJtysfZXh+y+AGORc2rPS7yHxBUg==
+  dependencies:
+    "@babel/types" "^7.8.0"
+    jsesc "^2.5.1"
+    lodash "^4.17.13"
+    source-map "^0.5.0"
+
 "@babel/helper-annotate-as-pure@^7.0.0":
   version "7.0.0"
   resolved "https://registry.yarnpkg.com/@babel/helper-annotate-as-pure/-/helper-annotate-as-pure-7.0.0.tgz#323d39dd0b50e10c7c06ca7d7638e6864d8c5c32"
@@ -78,16 +95,17 @@
     "@babel/traverse" "^7.4.4"
     "@babel/types" "^7.4.4"
 
-"@babel/helper-create-class-features-plugin@^7.4.4":
-  version "7.4.4"
-  resolved "https://registry.yarnpkg.com/@babel/helper-create-class-features-plugin/-/helper-create-class-features-plugin-7.4.4.tgz#fc3d690af6554cc9efc607364a82d48f58736dba"
+"@babel/helper-create-class-features-plugin@^7.8.0":
+  version "7.8.0"
+  resolved "https://registry.yarnpkg.com/@babel/helper-create-class-features-plugin/-/helper-create-class-features-plugin-7.8.0.tgz#b3ddf557ed4656e0d296c3b0f3fcd381ea8de72c"
+  integrity sha512-ctCvqYBTlwEl2uF4hCxE0cd/sSw71Zfag0jKa39y4HDLh0BQ4PVBX1384Ye8GqrEZ69xgLp9fwPbv3GgIDDF2Q==
   dependencies:
-    "@babel/helper-function-name" "^7.1.0"
-    "@babel/helper-member-expression-to-functions" "^7.0.0"
-    "@babel/helper-optimise-call-expression" "^7.0.0"
-    "@babel/helper-plugin-utils" "^7.0.0"
-    "@babel/helper-replace-supers" "^7.4.4"
-    "@babel/helper-split-export-declaration" "^7.4.4"
+    "@babel/helper-function-name" "^7.8.0"
+    "@babel/helper-member-expression-to-functions" "^7.8.0"
+    "@babel/helper-optimise-call-expression" "^7.8.0"
+    "@babel/helper-plugin-utils" "^7.8.0"
+    "@babel/helper-replace-supers" "^7.8.0"
+    "@babel/helper-split-export-declaration" "^7.8.0"
 
 "@babel/helper-define-map@^7.5.5":
   version "7.5.5"
@@ -113,24 +131,34 @@
     "@babel/template" "^7.1.0"
     "@babel/types" "^7.0.0"
 
+"@babel/helper-function-name@^7.8.0":
+  version "7.8.0"
+  resolved "https://registry.yarnpkg.com/@babel/helper-function-name/-/helper-function-name-7.8.0.tgz#dde5cf0d6b15c21817a67dd66fe7350348e023bf"
+  integrity sha512-x9psucuU0Xalw+0Vpr2FYJMLB7/KnPSLZhlkUyOGbYAWRDfmtZBrguYpJYiaNCRV7vGkYjO/gF6/J6yMvdWTDw==
+  dependencies:
+    "@babel/helper-get-function-arity" "^7.8.0"
+    "@babel/template" "^7.8.0"
+    "@babel/types" "^7.8.0"
+
 "@babel/helper-get-function-arity@^7.0.0":
   version "7.0.0"
   resolved "https://registry.yarnpkg.com/@babel/helper-get-function-arity/-/helper-get-function-arity-7.0.0.tgz#83572d4320e2a4657263734113c42868b64e49c3"
   dependencies:
     "@babel/types" "^7.0.0"
 
+"@babel/helper-get-function-arity@^7.8.0":
+  version "7.8.0"
+  resolved "https://registry.yarnpkg.com/@babel/helper-get-function-arity/-/helper-get-function-arity-7.8.0.tgz#90977f61d76d2225d1ae0208def7df22ea92792e"
+  integrity sha512-eUP5grliToMapQiTaYS2AAO/WwaCG7cuJztR1v/a1aPzUzUeGt+AaI9OvLATc/AfFkF8SLJ10d5ugGt/AQ9d6w==
+  dependencies:
+    "@babel/types" "^7.8.0"
+
 "@babel/helper-hoist-variables@^7.4.4":
   version "7.4.4"
   resolved "https://registry.yarnpkg.com/@babel/helper-hoist-variables/-/helper-hoist-variables-7.4.4.tgz#0298b5f25c8c09c53102d52ac4a98f773eb2850a"
   dependencies:
     "@babel/types" "^7.4.4"
 
-"@babel/helper-member-expression-to-functions@^7.0.0":
-  version "7.0.0"
-  resolved "https://registry.yarnpkg.com/@babel/helper-member-expression-to-functions/-/helper-member-expression-to-functions-7.0.0.tgz#8cd14b0a0df7ff00f009e7d7a436945f47c7a16f"
-  dependencies:
-    "@babel/types" "^7.0.0"
-
 "@babel/helper-member-expression-to-functions@^7.5.5":
   version "7.5.5"
   resolved "https://registry.yarnpkg.com/@babel/helper-member-expression-to-functions/-/helper-member-expression-to-functions-7.5.5.tgz#1fb5b8ec4453a93c439ee9fe3aeea4a84b76b590"
@@ -138,6 +166,13 @@
   dependencies:
     "@babel/types" "^7.5.5"
 
+"@babel/helper-member-expression-to-functions@^7.8.0":
+  version "7.8.0"
+  resolved "https://registry.yarnpkg.com/@babel/helper-member-expression-to-functions/-/helper-member-expression-to-functions-7.8.0.tgz#50d0ed445d2da11beb60e2dbc2c428254bd5a4ae"
+  integrity sha512-0m1QabGrdXuoxX/g+KOAGndoHwskC70WweqHRQyCsaO67KOEELYh4ECcGw6ZGKjDKa5Y7SW4Qbhw6ly4Fah/jQ==
+  dependencies:
+    "@babel/types" "^7.8.0"
+
 "@babel/helper-module-imports@^7.0.0":
   version "7.0.0"
   resolved "https://registry.yarnpkg.com/@babel/helper-module-imports/-/helper-module-imports-7.0.0.tgz#96081b7111e486da4d2cd971ad1a4fe216cc2e3d"
@@ -172,9 +207,17 @@
   dependencies:
     "@babel/types" "^7.0.0"
 
-"@babel/helper-plugin-utils@^7.0.0":
-  version "7.0.0"
-  resolved "https://registry.yarnpkg.com/@babel/helper-plugin-utils/-/helper-plugin-utils-7.0.0.tgz#bbb3fbee98661c569034237cc03967ba99b4f250"
+"@babel/helper-optimise-call-expression@^7.8.0":
+  version "7.8.0"
+  resolved "https://registry.yarnpkg.com/@babel/helper-optimise-call-expression/-/helper-optimise-call-expression-7.8.0.tgz#3df62773cf210db9ed34c2bb39fece5acd1e1733"
+  integrity sha512-aiJt1m+K57y0n10fTw+QXcCXzmpkG+o+NoQmAZqlZPstkTE0PZT+Z27QSd/6Gf00nuXJQO4NiJ0/YagSW5kC2A==
+  dependencies:
+    "@babel/types" "^7.8.0"
+
+"@babel/helper-plugin-utils@^7.0.0", "@babel/helper-plugin-utils@^7.8.0":
+  version "7.8.0"
+  resolved "https://registry.yarnpkg.com/@babel/helper-plugin-utils/-/helper-plugin-utils-7.8.0.tgz#59ec882d43c21c544ccb51decaecb306b34a8231"
+  integrity sha512-+hAlRGdf8fHQAyNnDBqTHQhwdLURLdrCROoWaEQYiQhk2sV9Rhs+GoFZZfMJExTq9HG8o2NX3uN2G90bFtmFdA==
 
 "@babel/helper-regex@^7.0.0":
   version "7.0.0"
@@ -198,15 +241,6 @@
     "@babel/traverse" "^7.1.0"
     "@babel/types" "^7.0.0"
 
-"@babel/helper-replace-supers@^7.4.4":
-  version "7.4.4"
-  resolved "https://registry.yarnpkg.com/@babel/helper-replace-supers/-/helper-replace-supers-7.4.4.tgz#aee41783ebe4f2d3ab3ae775e1cc6f1a90cefa27"
-  dependencies:
-    "@babel/helper-member-expression-to-functions" "^7.0.0"
-    "@babel/helper-optimise-call-expression" "^7.0.0"
-    "@babel/traverse" "^7.4.4"
-    "@babel/types" "^7.4.4"
-
 "@babel/helper-replace-supers@^7.5.5":
   version "7.5.5"
   resolved "https://registry.yarnpkg.com/@babel/helper-replace-supers/-/helper-replace-supers-7.5.5.tgz#f84ce43df031222d2bad068d2626cb5799c34bc2"
@@ -217,6 +251,16 @@
     "@babel/traverse" "^7.5.5"
     "@babel/types" "^7.5.5"
 
+"@babel/helper-replace-supers@^7.8.0":
+  version "7.8.0"
+  resolved "https://registry.yarnpkg.com/@babel/helper-replace-supers/-/helper-replace-supers-7.8.0.tgz#d83cb117edb820eebe9ae6c970a8ad5eac09d19f"
+  integrity sha512-R2CyorW4tcO3YzdkClLpt6MS84G+tPkOi0MmiCn1bvYVnmDpdl9R15XOi3NQW2mhOAEeBnuQ4g1Bh7pT2sX8fg==
+  dependencies:
+    "@babel/helper-member-expression-to-functions" "^7.8.0"
+    "@babel/helper-optimise-call-expression" "^7.8.0"
+    "@babel/traverse" "^7.8.0"
+    "@babel/types" "^7.8.0"
+
 "@babel/helper-simple-access@^7.1.0":
   version "7.1.0"
   resolved "https://registry.yarnpkg.com/@babel/helper-simple-access/-/helper-simple-access-7.1.0.tgz#65eeb954c8c245beaa4e859da6188f39d71e585c"
@@ -236,6 +280,13 @@
   dependencies:
     "@babel/types" "^7.4.4"
 
+"@babel/helper-split-export-declaration@^7.8.0":
+  version "7.8.0"
+  resolved "https://registry.yarnpkg.com/@babel/helper-split-export-declaration/-/helper-split-export-declaration-7.8.0.tgz#ed10cb03b07454c0d40735fad4e9c9711e739588"
+  integrity sha512-YhYFhH4T6DlbT6CPtVgLfC1Jp2gbCawU/ml7WJvUpBg01bCrXSzTYMZZXbbIGjq/kHmK8YUATxTppcRGzj31pA==
+  dependencies:
+    "@babel/types" "^7.8.0"
+
 "@babel/helper-wrap-function@^7.1.0":
   version "7.2.0"
   resolved "https://registry.yarnpkg.com/@babel/helper-wrap-function/-/helper-wrap-function-7.2.0.tgz#c4e0012445769e2815b55296ead43a958549f6fa"
@@ -262,6 +313,15 @@
     esutils "^2.0.2"
     js-tokens "^4.0.0"
 
+"@babel/highlight@^7.8.0":
+  version "7.8.0"
+  resolved "https://registry.yarnpkg.com/@babel/highlight/-/highlight-7.8.0.tgz#4cc003dc10359919e2e3a1d9459150942913dd1a"
+  integrity sha512-OsdTJbHlPtIk2mmtwXItYrdmalJ8T0zpVzNAbKSkHshuywj7zb29Y09McV/jQsQunc/nEyHiPV2oy9llYMLqxw==
+  dependencies:
+    chalk "^2.0.0"
+    esutils "^2.0.2"
+    js-tokens "^4.0.0"
+
 "@babel/node@7.5.5":
   version "7.5.5"
   resolved "https://registry.yarnpkg.com/@babel/node/-/node-7.5.5.tgz#5db48a3bcee64d9eda6474f2a0a55b235d0438b5"
@@ -279,6 +339,11 @@
   resolved "https://registry.yarnpkg.com/@babel/parser/-/parser-7.5.5.tgz#02f077ac8817d3df4a832ef59de67565e71cca4b"
   integrity sha512-E5BN68cqR7dhKan1SfqgPGhQ178bkVKpXTPEXnFJBrEt8/DKRZlybmy+IgYLTeN7tp1R5Ccmbm2rBk17sHYU3g==
 
+"@babel/parser@^7.8.0":
+  version "7.8.0"
+  resolved "https://registry.yarnpkg.com/@babel/parser/-/parser-7.8.0.tgz#54682775f1fb25dd29a93a02315aab29a6a292bb"
+  integrity sha512-VVtsnUYbd1+2A2vOVhm4P2qNXQE8L/W859GpUHfUcdhX8d3pEKThZuIr6fztocWx9HbK+00/CR0tXnhAggJ4CA==
+
 "@babel/plugin-proposal-async-generator-functions@^7.2.0":
   version "7.2.0"
   resolved "https://registry.yarnpkg.com/@babel/plugin-proposal-async-generator-functions/-/plugin-proposal-async-generator-functions-7.2.0.tgz#b289b306669dce4ad20b0252889a15768c9d417e"
@@ -287,12 +352,13 @@
     "@babel/helper-remap-async-to-generator" "^7.1.0"
     "@babel/plugin-syntax-async-generators" "^7.2.0"
 
-"@babel/plugin-proposal-class-properties@7.4.4":
-  version "7.4.4"
-  resolved "https://registry.yarnpkg.com/@babel/plugin-proposal-class-properties/-/plugin-proposal-class-properties-7.4.4.tgz#93a6486eed86d53452ab9bab35e368e9461198ce"
+"@babel/plugin-proposal-class-properties@7.8.0":
+  version "7.8.0"
+  resolved "https://registry.yarnpkg.com/@babel/plugin-proposal-class-properties/-/plugin-proposal-class-properties-7.8.0.tgz#bb3325d9166c80db8f2e15fc0bb6d61d7300e373"
+  integrity sha512-eVGj5NauhKCwABQjKIYncMQh9HtFsBrIcdsxImbTdUIaGnjymsVsBGmDQaDuPL/WCjYn6vPL4d+yvI6zy+VkrQ==
   dependencies:
-    "@babel/helper-create-class-features-plugin" "^7.4.4"
-    "@babel/helper-plugin-utils" "^7.0.0"
+    "@babel/helper-create-class-features-plugin" "^7.8.0"
+    "@babel/helper-plugin-utils" "^7.8.0"
 
 "@babel/plugin-proposal-dynamic-import@^7.5.0":
   version "7.5.0"
@@ -689,6 +755,15 @@
     "@babel/parser" "^7.4.4"
     "@babel/types" "^7.4.4"
 
+"@babel/template@^7.8.0":
+  version "7.8.0"
+  resolved "https://registry.yarnpkg.com/@babel/template/-/template-7.8.0.tgz#a32f57ad3be89c0fa69ae87b53b4826844dc6330"
+  integrity sha512-0NNMDsY2t3ltAVVK1WHNiaePo3tXPUeJpCX4I3xSKFoEl852wJHG8mrgHVADf8Lz1y+8al9cF7cSSfzSnFSYiw==
+  dependencies:
+    "@babel/code-frame" "^7.8.0"
+    "@babel/parser" "^7.8.0"
+    "@babel/types" "^7.8.0"
+
 "@babel/traverse@^7.0.0", "@babel/traverse@^7.1.0", "@babel/traverse@^7.4.4", "@babel/traverse@^7.5.5":
   version "7.5.5"
   resolved "https://registry.yarnpkg.com/@babel/traverse/-/traverse-7.5.5.tgz#f664f8f368ed32988cd648da9f72d5ca70f165bb"
@@ -704,6 +779,21 @@
     globals "^11.1.0"
     lodash "^4.17.13"
 
+"@babel/traverse@^7.8.0":
+  version "7.8.0"
+  resolved "https://registry.yarnpkg.com/@babel/traverse/-/traverse-7.8.0.tgz#d85266fdcff553c10e57b672604b36383a127c1f"
+  integrity sha512-d/6sPXFLGlJHZO/zWDtgFaKyalCOHLedzxpVJn6el1cw+f2TZa7xZEszeXdOw6EUemqRFBAn106BWBvtSck9Qw==
+  dependencies:
+    "@babel/code-frame" "^7.8.0"
+    "@babel/generator" "^7.8.0"
+    "@babel/helper-function-name" "^7.8.0"
+    "@babel/helper-split-export-declaration" "^7.8.0"
+    "@babel/parser" "^7.8.0"
+    "@babel/types" "^7.8.0"
+    debug "^4.1.0"
+    globals "^11.1.0"
+    lodash "^4.17.13"
+
 "@babel/types@^7.0.0", "@babel/types@^7.2.0", "@babel/types@^7.2.2", "@babel/types@^7.4.4", "@babel/types@^7.5.5":
   version "7.5.5"
   resolved "https://registry.yarnpkg.com/@babel/types/-/types-7.5.5.tgz#97b9f728e182785909aa4ab56264f090a028d18a"
@@ -713,6 +803,15 @@
     lodash "^4.17.13"
     to-fast-properties "^2.0.0"
 
+"@babel/types@^7.8.0":
+  version "7.8.0"
+  resolved "https://registry.yarnpkg.com/@babel/types/-/types-7.8.0.tgz#1a2039a028057a2c888b668d94c98e61ea906e7f"
+  integrity sha512-1RF84ehyx9HH09dMMwGWl3UTWlVoCPtqqJPjGuC4JzMe1ZIVDJ2DT8mv3cPv/A7veLD6sgR7vi95lJqm+ZayIg==
+  dependencies:
+    esutils "^2.0.2"
+    lodash "^4.17.13"
+    to-fast-properties "^2.0.0"
+
 "@samverschueren/stream-to-observable@^0.3.0":
   version "0.3.0"
   resolved "https://registry.yarnpkg.com/@samverschueren/stream-to-observable/-/stream-to-observable-0.3.0.tgz#ecdf48d532c58ea477acfcab80348424f8d0662f"