.travis.yml in rack-dev-mark-0.7.5 vs .travis.yml in rack-dev-mark-0.7.6

@@ -1,11 +1,11 @@
 language: ruby
 
 rvm:
-  - 2.0.0
-  - 2.1
   - 2.2
+  - 2.3
+  - 2.4.0
 
 install:
   - "gem install bundler"
   - "bundle install --jobs=3 --retry=3"
 
@@ -15,14 +15,28 @@
   - RACK_VERSION=1.2.0
   - RACK_VERSION=1.3.0
   - RACK_VERSION=1.4.0
   - RACK_VERSION=1.5.0
   - RACK_VERSION=1.6.0
+  - RACK_VERSION=2.0.0
   - RAILS_VERSION=3.2.0
   - RAILS_VERSION=4.0.0
   - RAILS_VERSION=4.1.0
   - RAILS_VERSION=4.2.0
+  - RAILS_VERSION=5.0.0
+  - RAILS_VERSION=5.1.0
   - I18N_VERSION=0.6.0
+
+matrix:
+  allow_failures:
+    - rvm: 2.4.0
+      env: RAILS_VERSION=3.2.0
+    - rvm: 2.4.0
+      env: RAILS_VERSION=4.0.0
+    - rvm: 2.4.0
+      env: RAILS_VERSION=4.1.0
+    - rvm: 2.4.0
+      env: RAILS_VERSION=4.2.0
 
 script: "bundle exec rake spec"
 
 branches:
   only: