.travis.yml in github-ds-0.4.0 vs .travis.yml in github-ds-0.5.0

@@ -1,17 +1,14 @@
 language: ruby
 before_install:
   - gem uninstall -v '>= 2' -i $(rvm gemdir)@global -ax bundler || true
   - gem install bundler -v '<2'
 rvm:
-  - 2.3
-  - 2.4
   - 2.5
+  - 2.6
+  - 2.7
 script: bundle exec rake
 env:
-  - RAILS_VERSION=6.0.0.rc1
+  - RAILS_VERSION=6.0.3.1
   - RAILS_VERSION=5.2.0
-  - RAILS_VERSION=5.1.5
-  - RAILS_VERSION=5.0.6
-  - RAILS_VERSION=4.2.10
 services:
   - mysql