.travis.yml in unread-0.9.0 vs .travis.yml in unread-0.9.1

- old
+ new
@@ -1,40 +1,45 @@
 language: ruby
 rvm:
   - 2.0.0
   - 2.1.10
-  - 2.2.6
+  - 2.2.7
   - 2.3.3
-  - 2.4.0
+  - 2.4.1
 gemfile:
+  - gemfiles/rails_5_1.gemfile
   - gemfiles/rails_5_0.gemfile
   - gemfiles/rails_4_2.gemfile
   - gemfiles/rails_4_1.gemfile
   - gemfiles/rails_4_0.gemfile
   - gemfiles/rails_3_2.gemfile
   - gemfiles/rails_3_1.gemfile
   - gemfiles/rails_3_0.gemfile
 matrix:
   exclude:
     - rvm: 2.0.0
+      gemfile: gemfiles/rails_5_1.gemfile
+    - rvm: 2.1.10
+      gemfile: gemfiles/rails_5_1.gemfile
+    - rvm: 2.0.0
       gemfile: gemfiles/rails_5_0.gemfile
     - rvm: 2.1.10
       gemfile: gemfiles/rails_5_0.gemfile
     - rvm: 2.3.3
       gemfile: gemfiles/rails_3_0.gemfile
     - rvm: 2.3.3
       gemfile: gemfiles/rails_3_1.gemfile
     - rvm: 2.3.3
       gemfile: gemfiles/rails_3_2.gemfile
-    - rvm: 2.4.0
+    - rvm: 2.4.1
       gemfile: gemfiles/rails_3_0.gemfile
-    - rvm: 2.4.0
+    - rvm: 2.4.1
       gemfile: gemfiles/rails_3_1.gemfile
-    - rvm: 2.4.0
+    - rvm: 2.4.1
       gemfile: gemfiles/rails_3_2.gemfile
-    - rvm: 2.4.0
+    - rvm: 2.4.1
       gemfile: gemfiles/rails_4_0.gemfile
-    - rvm: 2.4.0
+    - rvm: 2.4.1
       gemfile: gemfiles/rails_4_1.gemfile
 before_install: gem update bundler
 sudo: false
 env:
   - DB=sqlite