chore(package): update nyc to version 12.0.1

Closes loiane#91

Author: greenkeeper[bot]

package.json

@@ -71,7 +71,7 @@
     "istanbul": "^v1.1.0-alpha.1",
     "mocha": "^5.0.4",
     "mochawesome": "^3.0.2",
-    "nyc": "11.7.2",
+    "nyc": "12.0.1",
     "ts-node": "^5.0.1",
     "tslint": "^5.9.1",
     "typescript": "^2.7.2",