Merge pull request #627 from splitrb/bump-ruby-support-to-2-5-plus

Only support Ruby versions >= 2.5

Author: andrehjr

.travis.yml

@@ -1,26 +1,15 @@
 language: ruby
 rvm:
-  - 2.2.2
-  - 2.3.8
-  - 2.4.9
   - 2.5.7
-  - 2.6.5
+  - 2.6.6
+  - 2.7.1
 
 gemfile:
   - gemfiles/5.0.gemfile
   - gemfiles/5.1.gemfile
   - gemfiles/5.2.gemfile
   - gemfiles/6.0.gemfile
 
-matrix:
-  exclude:
-  - rvm: 2.2.2
-    gemfile: gemfiles/6.0.gemfile
-  - rvm: 2.3.8
-    gemfile: gemfiles/6.0.gemfile
-  - rvm: 2.4.9
-    gemfile: gemfiles/6.0.gemfile
-
 before_install:
   - gem uninstall -v '>= 2' -i $(rvm gemdir)@global -ax bundler || true
   - gem install bundler --version=1.17.3

split.gemspec

@@ -22,7 +22,7 @@ Gem::Specification.new do |s|
    "mailing_list_uri" => "https://groups.google.com/d/forum/split-ruby"
  }
 
-  s.required_ruby_version = '>= 2.2.2'
+  s.required_ruby_version = '>= 2.5.0'
   s.required_rubygems_version = '>= 2.0.0'
 
   s.files         = `git ls-files`.split("\n")