.travis.yml in closure_tree-6.0.0 vs .travis.yml in closure_tree-6.1.0

@@ -1,30 +1,39 @@
 cache: bundler
 sudo: false
 language: ruby
 rvm:
-  - 2.2.3
-  - jruby-head
+  - 2.3.1
+  - 2.2.5
+  - 2.0
+# these haven't been passing for a while:
+#  - jruby-head
+#  - rbx
 
 gemfile:
   - gemfiles/activerecord_4.1.gemfile
   - gemfiles/activerecord_4.2.gemfile
+  - gemfiles/activerecord_5.0_foreigner.gemfile
+  - gemfiles/activerecord_5.0.gemfile
   - gemfiles/activerecord_edge.gemfile
 
 env:
   - DB=sqlite
   - DB=mysql
   - DB=postgresql
 
-#addons:
-#  postgresql: "9.3"
-
 script: WITH_ADVISORY_LOCK_PREFIX=$TRAVIS_JOB_ID bundle exec rake --trace spec:all
 
 matrix:
   allow_failures:
     - gemfile: gemfiles/activerecord_edge.gemfile
     - 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_edge.gemfile