Inline export for consistency (#4066)

src/platforms/web/util/attrs.js

@@ -33,14 +33,13 @@ const isAttr = makeMap(
 )
 
 /* istanbul ignore next */
-const isRenderableAttr = (name: string): boolean => {
+export const isRenderableAttr = (name: string): boolean => {
   return (
     isAttr(name) ||
     name.indexOf('data-') === 0 ||
     name.indexOf('aria-') === 0
   )
 }
-export { isRenderableAttr }
 
 export const propsToAttrMap = {
   acceptCharset: 'accept-charset',