Fix: Replace 'walkes' with 'estree-walker' (styleguidist#1349)

Because walkes has LGPL-3 license.

Fixes styleguidist#1210

Author: eragon512

flow-typed/walkes.js.flow renamed to flow-typed/estree-walker.js.flow

@@ -1,10 +1,9 @@
-declare module 'walkes' {
+declare module 'estree-walker' {
 	import type { AcornNode } from 'acorn';
 
-	declare function walkes(
+	declare export function walk (
 		node: AcornNode,
 		visitors: { [key: string]: (node: AcornNode) => void }
 	): void;
-
-	declare export default typeof walkes;
+	
 }