chore(package): update nyc to version 12.0.2

Closes #29

Author: greenkeeper[bot]

package.json

@@ -11,7 +11,7 @@
   "devDependencies": {
     "ava": "^0.24.0",
     "coveralls": "^3.0.0",
-    "nyc": "^11.4.1",
+    "nyc": "^12.0.2",
     "reshape-standard": "^3.3.0",
     "snazzy": "^7.0.0",
     "spike-core": "^2.0.0",