Adding webhooks for gitter

.appveyor.yml

@@ -13,4 +13,11 @@ build_script:
   - cmake --build .
 
 test_script:
-    - ctest --output-on-failure
+  - ctest --output-on-failure
+
+notifications:
+  - provider: Webhook
+    url: https://webhooks.gitter.im/e/0185e91c5d989a476d7b
+    on_build_success: false
+    on_build_failure: true
+    on_build_status_changed: true

.travis.yml

@@ -78,3 +78,11 @@ deploy:
     repo: henryiii/CLI11
     tags: true
     condition: $DEPLOY_MAT = yes
+
+notifications:
+  webhooks:
+    urls:
+      - https://webhooks.gitter.im/e/bbdb3befce4c00448d24
+    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