.travis.yml in slack-ruby-client-0.8.1 vs .travis.yml in slack-ruby-client-0.9.0

@@ -1,24 +1,30 @@
 language: ruby
 
 cache: bundler
 
+rvm:
+  - 2.2
+  - 2.1
+  - 2.0
+  - rbx-2
+  - jruby-19mode
+  - ruby-head
+  - jruby-head
+
 matrix:
   include:
-    - rvm: 2.3.1
+    - rvm: 2.4.1
       script:
         - bundle exec danger
-    - rvm: 2.3.1
+    - rvm: 2.4.1
       env: CONCURRENCY=celluloid-io
-    - rvm: 2.3.1
+    - rvm: 2.4.1
       env: CONCURRENCY=faye-websocket
-    - rvm: 2.2
-    - rvm: 2.1
-    - rvm: 2.0
-    - rvm: rbx-2
-    - rvm: jruby-19mode
-    - rvm: ruby-head
-    - rvm: jruby-head
+    - rvm: 2.3.4
+      env: CONCURRENCY=celluloid-io
+    - rvm: 2.3.4
+      env: CONCURRENCY=faye-websocket
   allow_failures:
     - rvm: ruby-head
     - rvm: jruby-head
     - rvm: jruby-19mode
     - rvm: rbx-2