slack: Test fix do-destroy-rebuild-database.

Author: rht

.travis.yml

@@ -17,7 +17,7 @@ matrix:
     - zulip/integrations/slack/slackdata2zulipdata.py $PWD/slack-export-master.zip
     - mv zulip_data.tar.gz $HOME
     - cd
-    - git clone --depth=50 --branch=slack\+\+ https://github.com/rht/zulip.git
+    - git clone --depth=50 --branch=patch-import https://github.com/rht/zulip.git
     - cd zulip
     - mv ../zulip_data.tar.gz .
     - tar xf zulip_data.tar.gz