fix: don't use global interface typedefs

lib/handler.ts

@@ -1,6 +1,7 @@
 import { http, log } from "../deps.ts";
 import { verify } from "./crypto.ts";
 import filterWebhook from "./filter.ts";
+import { UrlConfig } from "./types.d.ts";
 import * as util from "./util.ts";
 
 export default async function handle(req: Request): Promise<Response> {

lib/types.d.ts

@@ -1,4 +1,4 @@
-interface UrlConfig {
+export interface UrlConfig {
     allowBranches?: string[];
     hideTags?: boolean;
 }