chore(package): update nyc to version 12.0.1

Author: greenkeeper[bot]

package.json

@@ -35,7 +35,7 @@
     "git-log-parser": "^1.2.0",
     "got": "^8.0.1",
     "mockserver-client": "^5.3.0",
-    "nyc": "^11.1.0",
+    "nyc": "^12.0.1",
     "p-retry": "^2.0.0",
     "semantic-release": "^15.0.0",
     "sinon": "^5.0.1",