chore(package): update nyc to version 12.0.1

Author: greenkeeper[bot]

package.json

@@ -41,7 +41,7 @@
     "get-stream": "^3.0.0",
     "got": "^8.0.0",
     "nock": "^9.1.0",
-    "nyc": "^11.2.1",
+    "nyc": "^12.0.1",
     "p-retry": "^2.0.0",
     "semantic-release": "^15.0.0",
     "sinon": "^5.0.0",