Upgrade outdated dependencies (#363)

- `electron-mocha`
- `electron-packager`

Signed-off-by: Juan Cruz Viotti <jviottidc@gmail.com>

package.json

@@ -75,9 +75,9 @@
   "devDependencies": {
     "angular-mocks": "^1.4.7",
     "electron-builder": "^2.6.0",
-    "electron-mocha": "^0.8.0",
+    "electron-mocha": "^1.2.2",
     "electron-osx-sign": "^0.3.0",
-    "electron-packager": "^6.0.0",
+    "electron-packager": "^7.0.1",
     "electron-prebuilt": "^0.37.6",
     "gulp": "^3.9.0",
     "gulp-jscs": "^3.0.2",