fix(typings): add regexp as type of path (#2157)

https:/alexmingoia/koa-router/blob/master/lib/router.js#L194

index.d.ts

@@ -494,6 +494,8 @@ declare interface EggApplication extends KoaApplication { // tslint:disable-line
  url(name: string, params: any): any;
 }
 
+type RouterPath = string | RegExp;
+
 export interface Application extends EggApplication {
  /**
  * global locals for view
@@ -504,26 +506,26 @@ export interface Application extends EggApplication {
  /**
  * HTTP get method
  */
- get(path: string, fn: string): void;
- get(path: string, ...middleware: any[]): void;
+ get(path: RouterPath, fn: string): void;
+ get(path: RouterPath, ...middleware: any[]): void;
 
  /**
  * HTTP post method
  */
- post(path: string, fn: string): void;
- post(path: string, ...middleware: any[]): void;
+ post(path: RouterPath, fn: string): void;
+ post(path: RouterPath, ...middleware: any[]): void;
 
  /**
  * HTTP put method
  */
- put(path: string, fn: string): void;
- put(path: string, ...middleware: any[]): void;
+ put(path: RouterPath, fn: string): void;
+ put(path: RouterPath, ...middleware: any[]): void;
 
  /**
  * HTTP delete method
  */
- delete(path: string, fn: string): void;
- delete(path: string, ...middleware: any[]): void;
+ delete(path: RouterPath, fn: string): void;
+ delete(path: RouterPath, ...middleware: any[]): void;
 
  /**
  * restful router api