more concise version

Author: Victor Saiz

src/components/themr.js

@@ -85,11 +85,11 @@ export default (componentName, localTheme, options = {}) => (ThemedComponent) =>
 function themeable(style = {}, theme) {
   if (!theme) return style
   return Object.keys(theme).reduce((result, key) => (
-    Object.assign(result,
-      style[key] && theme[key].indexOf(style[key]) === -1
-        ? { [key]: `${style[key]} ${theme[key]}` }
-        : { [key]: theme[key] || style[key] }
-    )), style)
+    Object.assign(result, { [key]:
+       style[key] && theme[key].indexOf(style[key]) === -1
+       ? `${style[key]} ${theme[key]}`
+       : theme[key] || style[key]
+    })), style)
 }
 
 function validateComposeOption(composeTheme) {