Update electron-builder

Author: huv1k

packages/graphql-playground-electron/package.json

@@ -138,7 +138,7 @@
     "concurrently": "3.5.1",
     "css-loader": "0.28.11",
     "electron": "2.0.11",
-    "electron-builder": "20.15.1",
+    "electron-builder": "^20.34.0",
     "electron-devtools-installer": "2.2.4",
     "extract-text-webpack-plugin": "3.0.2",
     "file-loader": "1.1.11",