Update Electron 0.27.2

Author: Emmanouil Konstantinidis

package.json

@@ -121,7 +121,7 @@
   },
   "devDependencies": {
     "electron-packager": "=4.1.2",
-    "electron-prebuilt": "=0.27.1",
+    "electron-prebuilt": "=0.27.2",
     "esprima-fb": "=15001.1.0-dev-harmony-fb",
     "grunt": "=0.4.5",
     "grunt-contrib-clean": "=0.6.0",