chore: update nyc to 13.1.0

Author: whizark

package.json

@@ -54,7 +54,7 @@
     "coveralls": "~3.0.2",
     "intelli-espower-loader": "~1.0.1",
     "mocha": "~5.2.0",
-    "nyc": "~13.0.1",
+    "nyc": "~13.1.0",
     "power-assert": "~1.6.1",
     "standard-version": "~4.4.0"
   },