chore(package): update nyc to version 12.0.1

Author: greenkeeper[bot]

package.json

@@ -63,7 +63,7 @@
     "jasmine-spec-reporter": "^4.2.1",
     "jasmine-ts": "^0.2.1",
     "merge-stream": "^1.0.1",
-    "nyc": "^11.7.3",
+    "nyc": "^12.0.1",
     "run-sequence": "^2.2.1",
     "tslint": "^5.10.0",
     "typedoc": "^0.11.1",