chore(package): update nyc to version 12.0.2

Closes #130

Author: greenkeeper[bot]

package.json

@@ -59,7 +59,7 @@
     "eslint-plugin-react": "^7.0.0",
     "file-loader": "^1.0.0-rc.0",
     "flow-bin": "^0.57.1",
-    "nyc": "^11.0.2",
+    "nyc": "^12.0.2",
     "react": "^15.4.2",
     "react-addons-test-utils": "^15.4.2",
     "react-dom": "^15.4.2",