Updated Electron version to patch security issues.

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Former-commit-id: f842555414e6bc4437652b53299de78179ada7f5

Author: javiercordero

package-lock.json

@@ -42,7 +42,7 @@
     "deb-version-compare": "git+https://github.com/sdumetz/node-deb-version-compare.git"
   },
   "devDependencies": {
-    "electron": "^1.8.1"
+    "electron": "^1.8.2-beta.4"
   },
   "engine": "node >= 8.2.1",
   "preferGlobal": "false"