.travis.yml: remove stale Hipchat notifications

.travis.yml

@@ -8,9 +8,3 @@ notifications:
   email:
     on_success: change
     on_failure: change
-  hipchat:
-    format: html
-    template:
-      - "<a href='https://github.com/%{repository}'>%{repository}</a>#<a href='%{build_url}'>%{build_number}</a>: <code><a href='%{compare_url}'>%{commit}</a></code> on <code>%{branch}</code> by %{author} has <a href='%{build_url}'>%{result}</a>."
-    rooms:
-      secure: r14/5ydt3YeCGxPlEsEk1D3zH/07AuwxOmVK5R2Emc6vAksLc1FDsRnmxFrbS+fsV50uc8w97EWU2uavsmv7D0kzV4L/bxZmd1z44egsppVR+N5FoyJlQxYzSBLx1pequ+HYV3psMdWjcchpVoRZmqCgaYzCpE3vRIM5grUD4OI=