Add Gitter integration notifications in travis config

Signed-off-by: Thomas Druez <tdruez@nexb.com>

Author: tdruez

.travis.yml

@@ -4,4 +4,12 @@ python: 3.6
 install: pip install pycodestyle
 
 before_script:
-  - pycodestyle --exclude=migrations,settings.py --max-line-length=100 .
+  - pycodestyle --exclude=migrations,settings.py --max-line-length=100 .
+
+notifications:
+  webhooks:
+    urls:
+      - https://webhooks.gitter.im/e/b119fa557626081e1f36
+    on_success: change  # options: [always|never|change] default: always
+    on_failure: always  # options: [always|never|change] default: always
+    on_start: never     # options: [always|never|change] default: always