Fix eventListener warning

Bump up maxEventListeners on the MatrixClient to shut up the warning about
leaks.

src/MatrixClientPeg.js

@@ -50,6 +50,11 @@ function createClientForPeg(hs_url, is_url, user_id, access_token, guestAccess)
     }
 
     matrixClient = Matrix.createClient(opts);
+
+    // we're going to add eventlisteners for each matrix event tile, so the
+    // potential number of event listeners is quite high.
+    matrixClient.setMaxListeners(500);
+
     if (guestAccess) {
         console.log("Guest: %s", guestAccess.isGuest());
         matrixClient.setGuest(guestAccess.isGuest());