fix: pin nyc to 11.7.0

Author: greenkeeper[bot]

package.json

@@ -70,7 +70,7 @@
     "istanbul": "^v1.1.0-alpha.1",
     "mocha": "^5.0.4",
     "mochawesome": "^3.0.2",
-    "nyc": "^11.6.0",
+    "nyc": "11.7.0",
     "ts-node": "^5.0.1",
     "tslint": "^5.9.1",
     "typescript": "^2.7.2",