.travis.yml in ably-1.0.4 vs .travis.yml in ably-1.0.5

@@ -4,10 +4,12 @@
   - RSPEC_RETRY=true PROTOCOL=msgpack
 language: ruby
 rvm:
   - 1.9.3
   - 2.0.0
+  - 2.1.10
   - 2.2.0
+  - 2.3.6
   - 2.4.1
 script: bundle exec rspec
 notifications:
   slack:
     secure: Xe8MwDcV2C8XLGk6O6Co31LpQiRSxsmS7Toy5vM7rHds5fnVRBNn5iX6Q5mXMdLOlnsMhjKLt7zl4fsBOZv+siQ+Us0omZSIYpXCYSCIj8nofReF0Lj8M4oa6lFSL5OuygO7PH+wLKTRxQURGZ6Pi1nHU+RE5izRmsewQHkhtY0=