minor update to travis config

Author: stygiansabyss

.travis.yml

@@ -4,20 +4,17 @@ php:
   - 7.0
   - 5.6
   - 5.5
-  - hhvm
 
 notifications:
   slack: nukacode:HyFrc2QLi5PC5fPxadm07O5v
   webhooks:
       urls:
         - https://webhooks.gitter.im/e/213257627c4e40ffc03c
-      on_success: always  # options: [always|never|change] default: always
+      on_success: change  # options: [always|never|change] default: always
       on_failure: always  # options: [always|never|change] default: always
       on_start: false     # default: false
 
 matrix:
-  allow_failures:
-    - php: hhvm
   fast_finish: true
 
 before_script: