fix: add webhooksPath property to enable function execution (#94)

Author: Genyus

function.js

@@ -1,4 +1,4 @@
 const { createNodeMiddleware, createProbot } = require("probot");
 const app = require("./app");
 
-exports.probotApp = createNodeMiddleware(app, { probot: createProbot() });
+exports.probotApp = createNodeMiddleware(app, { probot: createProbot(), webhooksPath: "/" });