chore(package): update nyc to version 11.0.0

Author: greenkeeper[bot]

package.json

@@ -36,7 +36,7 @@
     "codeclimate-test-reporter": "^0.4.0",
     "coveralls": "^2.11.15",
     "esdoc": "^0.5.2",
-    "nyc": "^10.1.2"
+    "nyc": "^11.0.0"
   },
   "homepage": "https://aureooms.github.io/js-red-black-tree",
   "keywords": [