chore(package): update nyc to version 12.0.1 (#25)

Author: greenkeeper[bot]

package.json

@@ -37,7 +37,7 @@
   },
   "devDependencies": {
     "mocha": "^5.2.0",
-    "nyc": "^11.8.0",
+    "nyc": "^12.0.1",
     "shelljs": "^0.8.1",
     "showdown": "^1.8.6"
   }