chore(package): update nyc to version 12.0.1

Author: greenkeeper[bot]

Diff for: package.json

@@ -32,7 +32,7 @@
     "conventional-changelog-express": "^1.0.0",
     "conventional-changelog-jshint": "^1.0.0",
     "cz-conventional-changelog": "^2.0.0",
-    "nyc": "^11.1.0",
+    "nyc": "^12.0.1",
     "rimraf": "^2.6.1",
     "semantic-release": "^15.0.0",
     "sinon": "^5.0.0",