.travis.yml in capybara-screenshot-diff-0.5.0 vs .travis.yml in capybara-screenshot-diff-0.5.1

@@ -2,11 +2,10 @@
 rvm:
   - ruby-2.4.1
   - jruby-9.1.8.0
   - ruby-2.3.4
   - ruby-2.2.7
-  - ruby-2.1.9
   - ruby-head
   - jruby-head
 
 gemfile:
   - gemfiles/rails50.gemfile
@@ -17,12 +16,9 @@
 
 jdk:
   - oraclejdk8
 
 matrix:
-  exclude:
-    - rvm: ruby-2.1.9 # Not supported by Rails 5
-      gemfile: gemfiles/rails50.gemfile
   allow_failures:
     - rvm: jruby-head # FIXME: (uwe) Low coverage: https://github.com/jruby/jruby/issues/4404
       gemfile: gemfiles/rails50.gemfile
     - rvm: jruby-head # FIXME: (uwe) Low coverage: https://github.com/jruby/jruby/issues/4404
       gemfile: gemfiles/rails42.gemfile