chore(package): update nyc to version 12.0.2

Closes #54

Author: greenkeeper[bot]

package.json

@@ -54,7 +54,7 @@
     "mocha": "^5.0.2",
     "mocha-junit-reporter": "^1.17.0",
     "normalize-newline": "^3.0.0",
-    "nyc": "^11.4.1",
+    "nyc": "^12.0.2",
     "replace-ext": "^1.0.0",
     "rimraf": "^2.6.2",
     "standard": "^11.0.0"