chore(package): update nyc to version 10.0.0 (#144)

https://greenkeeper.io/

Author: greenkeeperio-bot

package.json

@@ -48,7 +48,7 @@
     "mocha": "^3.1.0",
     "mock-git": "^1.0.2",
     "mockery": "^2.0.0",
-    "nyc": "^8.1.0",
+    "nyc": "^10.0.0",
     "shelljs": "^0.7.3",
     "standard": "^8.0.0"
   }