Testing Travis notifications to email

.travis.yml

     on_start: never     # options: [always|never|change] default: always
     on_cancel: never    # options: [always|never|change] default: always
     on_error: always    # options: [always|never|change] default: always
+
+  email: true
+    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
+    on_cancel: never    # options: [always|never|change] default: always
+    on_error: always    # options: [always|never|change] default: always