chore(package): update nyc to version 13.3.0

Closes #12

Author: greenkeeper[bot]

package.json

@@ -32,7 +32,7 @@
     "greenkeeper-lockfile": "^1.15.1",
     "husky": "^1.0.0-rc.13",
     "mocha": "^5.2.0",
-    "nyc": "^12.0.2",
+    "nyc": "^13.3.0",
     "prettier": "^1.13.7",
     "script-loader": "^0.7.2",
     "semantic-release": "^15.8.1",