diff --git a/package-lock.json b/package-lock.json
index 57b0f0e..a5036ab 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -89,14 +89,14 @@
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-      "resolved": "https://registry.npmjs.org/asn1.js/-/asn1.js-5.4.1.tgz",
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+      "version": "4.10.1",
+      "resolved": "https://registry.npmjs.org/asn1.js/-/asn1.js-4.10.1.tgz",
+      "integrity": "sha512-p32cOF5q0Zqs9uBiONKYLm6BClCoBCM5O9JfeUSlnQLBTxYdTK+pW+nXflm8UkKd2UYlEbYz5qEi0JuZR9ckSw==",
+      "license": "MIT",
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         "bn.js": "^4.0.0",
         "inherits": "^2.0.1",
-        "minimalistic-assert": "^1.0.0",
-        "safer-buffer": "^2.1.0"
+        "minimalistic-assert": "^1.0.0"
       }
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     "node_modules/asn1.js/node_modules/bn.js": {
@@ -310,49 +310,37 @@
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-      "resolved": "https://registry.npmjs.org/browserify-rsa/-/browserify-rsa-4.1.0.tgz",
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+      "version": "4.1.1",
+      "resolved": "https://registry.npmjs.org/browserify-rsa/-/browserify-rsa-4.1.1.tgz",
+      "integrity": "sha512-YBjSAiTqM04ZVei6sXighu679a3SqWORA3qZTEqZImnlkDIFtKc6pNutpjyZ8RJTjQtuYfeetkxM11GwoYXMIQ==",
+      "license": "MIT",
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-        "bn.js": "^5.0.0",
-        "randombytes": "^2.0.1"
+        "bn.js": "^5.2.1",
+        "randombytes": "^2.1.0",
+        "safe-buffer": "^5.2.1"
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-      "resolved": "https://registry.npmjs.org/browserify-sign/-/browserify-sign-4.2.1.tgz",
-      "integrity": "sha512-/vrA5fguVAKKAVTNJjgSm1tRQDHUU6DbwO9IROu/0WAzC8PKhucDSh18J0RMvVeHAn5puMd+QHC2erPRNf8lmg==",
+      "version": "4.2.5",
+      "resolved": "https://registry.npmjs.org/browserify-sign/-/browserify-sign-4.2.5.tgz",
+      "integrity": "sha512-C2AUdAJg6rlM2W5QMp2Q4KGQMVBwR1lIimTsUnutJ8bMpW5B52pGpR2gEnNBNwijumDo5FojQ0L9JrXA8m4YEw==",
+      "license": "ISC",
       "dependencies": {
-        "bn.js": "^5.1.1",
-        "browserify-rsa": "^4.0.1",
+        "bn.js": "^5.2.2",
+        "browserify-rsa": "^4.1.1",
         "create-hash": "^1.2.0",
         "create-hmac": "^1.1.7",
-        "elliptic": "^6.5.3",
+        "elliptic": "^6.6.1",
         "inherits": "^2.0.4",
-        "parse-asn1": "^5.1.5",
-        "readable-stream": "^3.6.0",
-        "safe-buffer": "^5.2.0"
-      }
-    },
-    "node_modules/browserify-sign/node_modules/readable-stream": {
-      "version": "3.6.2",
-      "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-3.6.2.tgz",
-      "integrity": "sha512-9u/sniCrY3D5WdsERHzHE4G2YCXqoG5FTHUiCC4SIbr6XcLZBY05ya9EKjYek9O5xOAwjGq+1JdGBAS7Q9ScoA==",
-      "dependencies": {
-        "inherits": "^2.0.3",
-        "string_decoder": "^1.1.1",
-        "util-deprecate": "^1.0.1"
+        "parse-asn1": "^5.1.9",
+        "readable-stream": "^2.3.8",
+        "safe-buffer": "^5.2.1"
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-        "node": ">= 6"
-      }
-    },
-    "node_modules/browserify-sign/node_modules/string_decoder": {
-      "version": "1.3.0",
-      "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.3.0.tgz",
-      "integrity": "sha512-hkRX8U1WjJFd8LsDJ2yQ/wWWxaopEsABU1XfkM8A+j0+85JAGppt16cr1Whg6KIbb4okU6Mql6BOj+uup/wKeA==",
-      "dependencies": {
-        "safe-buffer": "~5.2.0"
+        "node": ">= 0.10"
       }
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     "node_modules/browserify-zlib": {
@@ -772,9 +760,10 @@
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-      "resolved": "https://registry.npmjs.org/elliptic/-/elliptic-6.5.4.tgz",
-      "integrity": "sha512-iLhC6ULemrljPZb+QutR5TQGB+pdW6KGD5RSegS+8sorOZT+rdQFbsQFJgvN3eRqNALqJer4oQ16YvJHlU8hzQ==",
+      "version": "6.6.1",
+      "resolved": "https://registry.npmjs.org/elliptic/-/elliptic-6.6.1.tgz",
+      "integrity": "sha512-RaddvvMatK2LJHqFJ+YA4WysVN5Ita9E35botqIYspQ4TkRAlCicdzKOjlyv/1Za5RyTNn7di//eEV0uTAfe3g==",
+      "license": "MIT",
       "dependencies": {
         "bn.js": "^4.11.9",
         "brorand": "^1.1.0",
@@ -1591,15 +1580,19 @@
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-      "resolved": "https://registry.npmjs.org/parse-asn1/-/parse-asn1-5.1.6.tgz",
-      "integrity": "sha512-RnZRo1EPU6JBnra2vGHj0yhp6ebyjBZpmUCLHWiFhxlzvBCCpAuZ7elsBp1PVAbQN0/04VD/19rfzlBSwLstMw==",
+      "version": "5.1.9",
+      "resolved": "https://registry.npmjs.org/parse-asn1/-/parse-asn1-5.1.9.tgz",
+      "integrity": "sha512-fIYNuZ/HastSb80baGOuPRo1O9cf4baWw5WsAp7dBuUzeTD/BoaG8sVTdlPFksBE2lF21dN+A1AnrpIjSWqHHg==",
+      "license": "ISC",
       "dependencies": {
-        "asn1.js": "^5.2.0",
-        "browserify-aes": "^1.0.0",
-        "evp_bytestokey": "^1.0.0",
-        "pbkdf2": "^3.0.3",
-        "safe-buffer": "^5.1.1"
+        "asn1.js": "^4.10.1",
+        "browserify-aes": "^1.2.0",
+        "evp_bytestokey": "^1.0.3",
+        "pbkdf2": "^3.1.5",
+        "safe-buffer": "^5.2.1"
+      },
+      "engines": {
+        "node": ">= 0.10"
       }
     },
     "node_modules/path-browserify": {
@@ -1970,11 +1963,6 @@
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-    "node_modules/safer-buffer": {
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-      "resolved": "https://registry.npmjs.org/safer-buffer/-/safer-buffer-2.1.2.tgz",
-      "integrity": "sha512-YZo3K82SD7Riyi0E1EQPojLz7kpepnSQI9IyPbHHg1XXXevb5dJI7tpyN2ADxGcQbHG7vcyRHk0cbwqcQriUtg=="
-    },
     "node_modules/semver": {
       "version": "5.7.2",
       "resolved": "https://registry.npmjs.org/semver/-/semver-5.7.2.tgz",