feat: createNodeMiddleware export (#2120)

Author: gr2m

README.md

@@ -624,7 +624,7 @@ const app = new App({
   webhooks: { secret },
 });
 
-app.webhooks.on("issue.opened", ({ octokit, payload }) => {
+app.webhooks.on("issues.opened", ({ octokit, payload }) => {
   return octokit.rest.issues.createComment({
     owner: payload.repository.owner.login,
     repo: payload.repository.name,