chore(package): update nsp to version 3.1.0

Closes #68

Author: greenkeeper[bot]

package.json

@@ -57,7 +57,7 @@
     "faucet": "0.0.1",
     "husky": "0.14.3",
     "istanbul": "0.4.5",
-    "nsp": "2.7.0",
+    "nsp": "3.1.0",
     "plato": "1.7.0",
     "rollup": "0.47.6",
     "semantic-release": "7.0.2",