Update babel presets and delete unneeded preset

Author: ryanhefner

.babelrc

@@ -1,7 +1,7 @@
 const BABEL_ENV = process.env.BABEL_ENV;
 const building = BABEL_ENV != undefined && BABEL_ENV !== 'cjs';
 
-const plugins = [];
+const plugins = ['transform-object-rest-spread'];
 
 if (BABEL_ENV === 'umd') {
   plugins.push('external-helpers');