chore(package): update nsp to version 3.1.0

Closes #44

Author: greenkeeper[bot]

Diff for: package.json

@@ -76,7 +76,7 @@
     "hihat": "^2.6.4",
     "in-publish": "^2.0.0",
     "nodemon": "^1.10.2",
-    "nsp": "^2.6.1",
+    "nsp": "^3.1.0",
     "prop-types": "^15.5.8",
     "react": "^15.5.4",
     "react-a11y": "^0.3.3",