Update nyc to version 11.9.0

Author: depfu[bot]

package.json

@@ -12,7 +12,7 @@
     "codecov": "^2.3.0",
     "graphql": "^0.11.7",
     "graphql-tag": "^2.10.0",
-    "nyc": "^11.2.1",
+    "nyc": "^11.9.0",
     "react-scripts-ts": "^2.6.0",
     "tslint": "^5.8.0",
     "typescript": "^2.6.2"