Fix #autojoin welcome message

As seen in https://github.com/gitterHQ/sidecar/issues/60
6 jobs for feature/fix-autojoin-welcome-message in 12 minutes and 26 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Build Unit Test
passed #62448550
package

00:07:07

passed #62448549
test

00:03:14

passed #62448548
validate

00:00:51

 
  Pre Deploy
passed #62448551
distribute_beta_staging

00:00:17

 
  Deploy
passed #62448553
docker
containerize

00:04:44

passed #62448554
internal
deploy_beta_staging

00:01:12