Update .travis.yml

Author: robotpilot

.travis.yml

@@ -12,7 +12,7 @@ compiler:
   - gcc
 notifications:
   email:
-    on_success: always
+    on_success: change
     on_failure: always
     recipients:
       - [email protected]
@@ -29,4 +29,4 @@ install:
   - git clone https://github.com/ros-industrial/industrial_ci.git .ci_config
 script:
   - source .ci_config/travis.sh
-  
+