Bump to Electron 11 beta

Electron 10 (and 9?) had glitchy behavior where some BrowserViews would
stop painting when the overlay view was removed and re-added.

package-lock.json

@@ -4735,9 +4735,9 @@
       }
     },
     "electron": {
-      "version": "10.1.5",
-      "resolved": "https://registry.npmjs.org/electron/-/electron-10.1.5.tgz",
-      "integrity": "sha512-fys/KnEfJq05TtMij+lFvLuKkuVH030CHYx03iZrW5DNNLwjE6cW3pysJ420lB0FRSfPjTHBMu2eVCf5TG71zQ==",
+      "version": "11.0.0-beta.20",
+      "resolved": "https://registry.npmjs.org/electron/-/electron-11.0.0-beta.20.tgz",
+      "integrity": "sha512-BzUFkhl+UW5qiaBcdCCoTgsYFjyZFSruPvpq1JACFzrXmrC6/vVb/mszqPT0KB9I55Elgnch/iAqvS62oRk72Q==",
       "requires": {
         "@electron/get": "^1.0.1",
         "@types/node": "^12.0.12",

package.json

@@ -20,7 +20,7 @@
     "color": "^3.1.2",
     "dank-twitch-irc": "^3.3.0",
     "ejs": "^3.1.3",
-    "electron": "^10.1.5",
+    "electron": "^11.0.0-beta.20",
     "jsondiffpatch": "^0.4.1",
     "koa": "^2.12.1",
     "koa-basic-auth": "^4.0.0",

webpack.config.js

@@ -72,7 +72,7 @@ const nodeConfig = {
 const browserConfig = {
   ...baseConfig({
     babel: {
-      presets: [['@babel/preset-env', { targets: { electron: '10' } }]],
+      presets: [['@babel/preset-env', { targets: { electron: '11' } }]],
     },
   }),
   devtool: 'cheap-source-map',