Clean up .babelrc.js and remove @babel/plugin-proposal-object-rest-spread from package.json

* @babel/plugin-proposal-object-rest-spread is already included in @babel/preset-env
* `exclude: ['transform-typeof-symbol']` did nothing with our config

Author: XhmikosR

.babelrc.js

@@ -4,12 +4,11 @@ module.exports = {
       '@babel/preset-env',
       {
         loose: true,
-        modules: false,
-        exclude: ['transform-typeof-symbol']
+        modules: false
       }
     ]
   ],
   plugins: [
     '@babel/plugin-proposal-object-rest-spread'
   ]
-};
+}

package.json

@@ -94,7 +94,6 @@
   "devDependencies": {
     "@babel/cli": "^7.10.1",
     "@babel/core": "^7.10.2",
-    "@babel/plugin-proposal-object-rest-spread": "^7.10.1",
     "@babel/preset-env": "^7.10.2",
     "@rollup/plugin-babel": "^5.0.3",
     "@rollup/plugin-commonjs": "^13.0.0",