fix issue #510, sync Pagination type defination

Author: inter-action

typings/index.d.ts

@@ -794,7 +794,7 @@ declare namespace ElementReact {
     total?: number
     pageCount?: number
     currentPage?: number
-    layout?: 'sizes' | 'prev' | 'pager' | 'next' | 'jumper' | '->' | 'total'
+    layout?: string,
     pageSizes?: number[]
     onCurrentChange?(currentPage?: number): void
     onSizeChange?(size?: number): void

typings/typing-tests/Pagination.tsx

@@ -5,7 +5,7 @@ import { Pagination as PaginationNext } from 'element-react/next'
 class Component extends React.Component<{}, {}> {
   onCurrentChange = (currentPage) => { }
   onSizeChange = (size) => { }
-  layout: 'sizes' | 'prev' | 'pager' | 'next' | 'jumper' | '->' | 'total'
+  layout: 'total, prev, pager, next'
   render() {
     return (
       <div>