chore(package): update nyc to version 12.0.1

Closes #23

Author: greenkeeper[bot]

package.json

@@ -15,7 +15,7 @@
   "devDependencies": {
     "ava": "^0.19.0",
     "coveralls": "^2.11.12",
-    "nyc": "^10.0.0",
+    "nyc": "^12.0.1",
     "reshape": "^0.4.0",
     "snazzy": "^6.0.0",
     "standard": "^10.0.0",