update mocha and nyc

Author: starpit

app/package.json

@@ -28,7 +28,7 @@
   },
   "devDependencies": {
     "electron": "~2.0.2",
-    "nyc": "^11.3.0"
+    "nyc": "^13.0.0"
   },
   "dependencies": {
     "about-window": "^1.11.0",