chore(package): update nyc to version 5.5.0

http://greenkeeper.io/

Author: greenkeeperio-bot

package.json

@@ -37,7 +37,7 @@
     "cz-conventional-changelog": "1.1.5",
     "in-publish": "2.0.0",
     "mocha": "2.3.4",
-    "nyc": "5.3.0",
+    "nyc": "5.5.0",
     "react": "0.14.6",
     "tslint": "3.3.0",
     "typescript": "1.7.5"