ruby 2.0 doesn't work with with AR edge

Author: mceachen

.travis.yml

@@ -29,10 +29,11 @@ matrix:
     - rvm: jruby-head
     - rvm: rbx
 
+  # rails 5+ requires ruby >= 2.2:
   exclude:
-    - rvm: ruby-head
-      gemfile: gemfiles/activerecord_4.1.gemfile
+    - rvm: 2.0
+      gemfile: gemfiles/activerecord_5.0_foreigner.gemfile
     - rvm: 2.0
       gemfile: gemfiles/activerecord_5.0.gemfile
     - rvm: 2.0
-      gemfile: gemfiles/activerecord_5.0_foreigner.gemfile
+      gemfile: gemfiles/activerecord_edge.gemfile