chore(package): update nyc to version 12.0.2

Closes #106

Author: greenkeeper[bot]

package.json

@@ -20,7 +20,7 @@
     "ava": "^0.20.0",
     "coveralls": "^2.13.1",
     "dotenv": "^4.0.0",
-    "nyc": "^11.0.3",
+    "nyc": "^12.0.2",
     "rimraf": "^2.6.1",
     "snazzy": "^7.0.0",
     "spike-core": "^2.0.0",