.travis.yml in acts_as_textcaptcha-4.2.0 vs .travis.yml in acts_as_textcaptcha-4.3.0

@@ -3,17 +3,13 @@
 gemfile:
   - gemfiles/rails_3.gemfile
   - gemfiles/rails_4.gemfile
   - gemfiles/rails_5.gemfile
 rvm:
-- 2.2.9
-- 2.3.6
-- 2.4.3
-- 2.5.0
-matrix:
-  exclude:
-    - rvm: 2.1.10
-      gemfile: gemfiles/rails_5.gemfile
+  - 2.2.9
+  - 2.3.6
+  - 2.4.3
+  - 2.5.0
 before_install:
   - gem update --system
 deploy:
   provider: rubygems
   api_key: