chore(package): update nyc to version 12.0.2

Closes #47

Author: greenkeeper[bot]

package.json

@@ -32,7 +32,7 @@
     "ava": "^0.25.0",
     "coveralls": "^3.0.0",
     "eslint": "^4.19.1",
-    "nyc": "^11.7.1",
+    "nyc": "^12.0.2",
     "tap-nyan": "1.1.0"
   },
   "dependencies": {