fix: export type only RestEndpointMethodTypes (#299)

Resolves #298

Author: antfu

src/index.ts

@@ -2,7 +2,7 @@ import { Octokit as Core } from "@octokit/core";
 import { requestLog } from "@octokit/plugin-request-log";
 import { paginateRest } from "@octokit/plugin-paginate-rest";
 import { legacyRestEndpointMethods } from "@octokit/plugin-rest-endpoint-methods";
-export { RestEndpointMethodTypes } from "@octokit/plugin-rest-endpoint-methods";
+export type { RestEndpointMethodTypes } from "@octokit/plugin-rest-endpoint-methods";
 
 import { VERSION } from "./version";