chore(package): update nyc to version 11.7.1

Author: greenkeeper[bot]

package.json

@@ -61,7 +61,7 @@
     "eslint-plugin-react": "~7.7.0",
     "husky": "~0.14.3",
     "mocha": "~5.1.0",
-    "nyc": "~11.6.0",
+    "nyc": "~11.7.1",
     "prettier": "~1.12.0",
     "readline-sync": "~1.4.9",
     "rimraf": "~2.6.2",