Send travis activity notices to #postgis-activity

See https://lists.osgeo.org/pipermail/postgis-devel/2015-October/025436.html git-svn-id: http://svn.osgeo.org/postgis/trunk@14339 b70326c6-7e19-0410-871a-916f4a2858ee

Author: Sandro Santilli

.travis.yml

@@ -30,7 +30,7 @@ notifications:
  email: false
  irc:
  channels:
- - "irc.freenode.org#postgis"
+ - "irc.freenode.org#postgis-activity"
  on_success: change
  on_failure: always
  use_notice: false