(ml5717) (mnr17) Use let in for loop to not leak out of scope

src/y-webrtc/index.js

@@ -41,7 +41,7 @@ function extend(Y) {
       webrtc.on("joinedRoom", () => {
         const id = webrtc.getMyId()
 
-        for (var f of self.userEventListeners) {
+        for (let f of self.userEventListeners) {
           f({ action: "userID", id: id })
         }