Added babel transform for Object.assign

Author: pascalgagneur

babel.config.js

@@ -2,6 +2,7 @@ const presets = ['@babel/env', '@babel/preset-react'];
 const plugins = [
   '@babel/plugin-transform-arrow-functions',
   '@babel/plugin-proposal-class-properties',
+  '@babel/plugin-transform-object-assign'
 ];
 
 module.exports = { presets, plugins };

package.json

@@ -54,6 +54,7 @@
     "@babel/core": "^7.1.2",
     "@babel/plugin-proposal-class-properties": "^7.1.0",
     "@babel/plugin-transform-arrow-functions": "^7.0.0",
+    "@babel/plugin-transform-object-assign": "^7.2.0",
     "@babel/preset-env": "^7.1.0",
     "@babel/preset-react": "^7.0.0",
     "@babel/register": "^7.0.0",