Update electron framework to version 3.0.8

On Ubuntu 18.10 there is a issue with glibc versions below 2.28 see
[Prebuilt Electron binaries segfault at startup on Arch Linux with glibc 2.28 #13972](electron/electron#13972)

Author: jhit

package.json

@@ -129,7 +129,7 @@
     "css-loader": "^0.19.0",
     "devtron": "^1.1.0",
     "dom-storage": "^2.0.2",
-    "electron": "3.0.3",
+    "electron": "3.0.8",
     "electron-packager": "^12.0.0",
     "eslint": "^3.13.1",
     "eslint-config-standard": "^6.2.1",