.travis.yml in currency_cloud-0.7.2 vs .travis.yml in currency_cloud-0.8.0

@@ -1,12 +1,15 @@
+dist: trusty
 language: ruby
 script: bundle exec rspec
 cache: bundler
 
 rvm:
   - 1.9.3
   - 2.0.0
   - 2.1
   - 2.2
+  - 2.3.4
+  - 2.4.1
   - jruby-19mode
-  - jruby-head
-  - rbx-2
+  - jruby-9.1.5.0 
+  - rbx-3.74