Test against Ruby 2.6.0, drop support for Ruby 2.2 (because EOL)

.travis.yml

@@ -1,9 +1,9 @@
 language: ruby
 rvm:
-  - 2.2.10
-  - 2.3.7
-  - 2.4.4
-  - 2.5.1
+  - 2.3.8
+  - 2.4.5
+  - 2.5.3
+  - 2.6.0
 gemfile:
   - gemfiles/rails_5_2.gemfile
   - gemfiles/rails_5_1.gemfile
@@ -13,13 +13,17 @@ gemfile:
   - gemfiles/rails_4_0.gemfile
 matrix:
   exclude:
-    - rvm: 2.4.4
+    - rvm: 2.4.5
       gemfile: gemfiles/rails_4_0.gemfile
-    - rvm: 2.4.4
+    - rvm: 2.4.5
       gemfile: gemfiles/rails_4_1.gemfile
-    - rvm: 2.5.1
+    - rvm: 2.5.3
       gemfile: gemfiles/rails_4_0.gemfile
-    - rvm: 2.5.1
+    - rvm: 2.5.3
+      gemfile: gemfiles/rails_4_1.gemfile
+    - rvm: 2.6.0
+      gemfile: gemfiles/rails_4_0.gemfile
+    - rvm: 2.6.0
       gemfile: gemfiles/rails_4_1.gemfile
 before_install: gem update bundler
 sudo: false

README.md

@@ -19,7 +19,7 @@ Ruby gem to manage read/unread status of ActiveRecord objects - and it's fast.
 
 ## Requirements
 
-* Ruby 2.2 or newer
+* Ruby 2.3 or newer
 * Rails 4.0 or newer (including Rails 5.1 and 5.2)
 * MySQL, PostgreSQL or SQLite
 * Needs a timestamp field in your models (like created_at or updated_at) with a database index on it

unread.gemspec

@@ -12,7 +12,7 @@ Gem::Specification.new do |s|
   s.homepage    = "https://github.com/ledermann/unread"
   s.summary     = %q{Manages read/unread status of ActiveRecord objects}
   s.description = %q{This gem creates a scope for unread objects and adds methods to mark objects as read }
-  s.required_ruby_version = '>= 2.2'
+  s.required_ruby_version = '>= 2.3'
 
   s.files         = `git ls-files -z`.split("\x0").reject do |f|
     f.match(%r{^(test|spec|features)/})