Upgrade to [email protected]

relatable: https://electronjs.org/blog/web-preferences-fix

package.json

@@ -65,7 +65,7 @@
     "babel-preset-env": "^1.6.1",
     "babel-preset-react": "^6.24.1",
     "babel-preset-stage-0": "^6.24.1",
-    "electron": "1.8.4",
+    "electron": "1.8.8",
     "electron-builder": "^20.6.2",
     "electron-devtools-installer": "^2.2.3",
     "electron-webpack": "^1.13.0",

yarn.lock

@@ -2936,9 +2936,9 @@ electron-webpack@^1.13.0:
     webpack-merge "^4.1.1"
     yargs "^11.0.0"
 
-[email protected].4:
-  version "1.8.4"
-  resolved "https://registry.yarnpkg.com/electron/-/electron-1.8.4.tgz#cca8d0e6889f238f55b414ad224f03e03b226a38"
+[email protected].8:
+  version "1.8.8"
+  resolved "https://registry.yarnpkg.com/electron/-/electron-1.8.8.tgz#a90cddb075291f49576993e6f5c8bb4439301cae"
   dependencies:
     "@types/node" "^8.0.24"
     electron-download "^3.0.1"