Fix style

Author: adamwathan

__tests__/processPlugins.test.js

@@ -259,10 +259,10 @@ test('plugins can add base styles with object syntax', () => {
     [
       function({ addBase }) {
         addBase({
-          'img': {
+          img: {
             maxWidth: '100%',
           },
-          'button': {
+          button: {
             fontFamily: 'inherit',
           },
         })

src/util/processPlugins.js

@@ -64,7 +64,7 @@ export default function(plugins, config) {
 
         pluginComponents.push(...styles.nodes)
       },
-      addBase: (baseStyles) => {
+      addBase: baseStyles => {
         pluginBaseStyles.push(...parseStyles(baseStyles))
       },
       addVariant: (name, generator) => {