.travis.yml in twilio-ruby-4.3.0 vs .travis.yml in twilio-ruby-4.4.0

- old
+ new

@@ -20,5 +20,12 @@
     - rvm: ruby-head
     - rvm: ruby
     - rvm: jruby-head
     - rvm: jruby
     - rvm: rbx-head
+notifications:
+  slack:
+    on_success: change
+    on_failure: change
+    rooms:
+      - secure: SVfWQUsuPNfFXU0gFl5OKDQU76Xw5FyZiGz3WzjNCLzLiUXvlu77b8v83ZATCBEgewhu/cXgy4BKTs2hmZ+R3jr/tEBR8wd9V+0cdffgN8L3Ald5MXtISofW5v33CXHYp5P9xIdvOJHVLl4ob01o53rfnfZF6Xi//2+VxR9lI9w=
+      - secure: MqUkEiU0WjSMeyhTkicCbftSQW0dK1Bp8qkoSidWqgM5hGFUAMwjxLZT5Erpua1o5V5cpOfyOqNNcYfgxyOamPLpbnQkaCu7VEABbkuPhVTtM+yuN/odwhGFd/Ph47Z63xxyVLdI4QxVAg+1TzlMijxFC7HAQtyuKYwrPrOSgTI=