q(...) -> Promise.resolve

```
find src test -name '*.js' | xargs perl -i -pe 's/\b[qQ]\(/Promise.resolve(/'
```

src/Rooms.js

@@ -102,7 +102,7 @@ export function guessAndSetDMRoom(room, isDirect) {
  */
 export function setDMRoom(roomId, userId) {
     if (MatrixClientPeg.get().isGuest()) {
-        return q();
+        return Promise.resolve();
     }
 
     const mDirectEvent = MatrixClientPeg.get().getAccountData('m.direct');