.travis.yml in active_shipping-1.7.3 vs .travis.yml in active_shipping-1.8.0

@@ -3,17 +3,25 @@
 sudo: false
 
 rvm:
 - "2.0"
 - "2.1"
-- "2.2"
+- "2.2.2"
 - "2.3.1"
 
 gemfile:
 - Gemfile.activesupport32
 - Gemfile.activesupport40
 - Gemfile.activesupport41
 - Gemfile.activesupport42
+- Gemfile.activesupport50
+
+matrix:
+  exclude:
+    - rvm: "2.0"
+      gemfile: Gemfile.activesupport50
+    - rvm: "2.1"
+      gemfile: Gemfile.activesupport50
 
 env:
   global:
   - ACTIVESHIPPING_NEW_ZEALAND_POST_KEY=4d9dc0f0-dda0-012e-066f-000c29b44ac0
   - ACTIVESHIPPING_CANADA_POST_LOGIN=CPC_DEMO_XML