Bump electron builder

package.json

@@ -12,6 +12,10 @@
   "engines": {
     "node": ">=4.2.0"
   },
+  "repository": {
+    "type": "git",
+    "url": "git://github.com/mattermost/desktop.git"
+  },
   "scripts": {
     "install": "cd src && npm install",
     "postinstall": "npm run build",
@@ -36,7 +40,7 @@
     "chai": "^3.5.0",
     "chai-as-promised": "^5.3.0",
     "devtron": "^1.3.0",
-    "electron-builder": "5.2.1",
+    "electron-builder": "7.10.2",
     "electron-connect": "~0.3.9",
     "electron-packager": "^7.0.1",
     "electron-prebuilt": "1.2.8",