Remove support to Ruby 2.2

Rails 6 will only support Ruby >= 2.3.

.travis.yml

@@ -60,7 +60,6 @@ env:
     - "GEM=ac:integration"
 
 rvm:
-  - 2.2.9
   - 2.3.6
   - 2.4.3
   - 2.5.0
@@ -70,7 +69,7 @@ matrix:
   include:
     - rvm: 2.5.0
       env: "GEM=av:ujs"
-    - rvm: 2.2.9
+    - rvm: 2.3.6
       env: "GEM=aj:integration"
       services:
         - memcached

actioncable/actioncable.gemspec

@@ -9,7 +9,7 @@ Gem::Specification.new do |s|
   s.summary     = "WebSocket framework for Rails."
   s.description = "Structure many real-time application concerns into channels over a single WebSocket connection."
 
-  s.required_ruby_version = ">= 2.2.2"
+  s.required_ruby_version = ">= 2.3.0"
 
   s.license = "MIT"
 

actionmailer/actionmailer.gemspec

@@ -9,7 +9,7 @@ Gem::Specification.new do |s|
   s.summary     = "Email composition, delivery, and receiving framework (part of Rails)."
   s.description = "Email on Rails. Compose, deliver, receive, and test emails using the familiar controller/view pattern. First-class support for multipart email and attachments."
 
-  s.required_ruby_version = ">= 2.2.2"
+  s.required_ruby_version = ">= 2.3.0"
 
   s.license = "MIT"
 

actionpack/actionpack.gemspec

@@ -9,7 +9,7 @@ Gem::Specification.new do |s|
   s.summary     = "Web-flow and rendering framework putting the VC in MVC (part of Rails)."
   s.description = "Web apps on Rails. Simple, battle-tested conventions for building and testing MVC web applications. Works with any Rack-compatible server."
 
-  s.required_ruby_version = ">= 2.2.2"
+  s.required_ruby_version = ">= 2.3.0"
 
   s.license = "MIT"
 

actionview/actionview.gemspec

@@ -9,7 +9,7 @@ Gem::Specification.new do |s|
   s.summary     = "Rendering framework putting the V in MVC (part of Rails)."
   s.description = "Simple, battle-tested conventions and helpers for building web pages."
 
-  s.required_ruby_version = ">= 2.2.2"
+  s.required_ruby_version = ">= 2.3.0"
 
   s.license = "MIT"
 

activejob/activejob.gemspec

@@ -9,7 +9,7 @@ Gem::Specification.new do |s|
   s.summary     = "Job framework with pluggable queues."
   s.description = "Declare job classes that can be run by a variety of queueing backends."
 
-  s.required_ruby_version = ">= 2.2.2"
+  s.required_ruby_version = ">= 2.3.0"
 
   s.license = "MIT"
 

activemodel/activemodel.gemspec

@@ -9,7 +9,7 @@ Gem::Specification.new do |s|
   s.summary     = "A toolkit for building modeling frameworks (part of Rails)."
   s.description = "A toolkit for building modeling frameworks like Active Record. Rich support for attributes, callbacks, validations, serialization, internationalization, and testing."
 
-  s.required_ruby_version = ">= 2.2.2"
+  s.required_ruby_version = ">= 2.3.0"
 
   s.license = "MIT"
 

activerecord/activerecord.gemspec

@@ -9,7 +9,7 @@ Gem::Specification.new do |s|
   s.summary     = "Object-relational mapper framework (part of Rails)."
   s.description = "Databases on Rails. Build a persistent domain model by mapping database tables to Ruby classes. Strong conventions for associations, validations, aggregations, migrations, and testing come baked-in."
 
-  s.required_ruby_version = ">= 2.2.2"
+  s.required_ruby_version = ">= 2.3.0"
 
   s.license = "MIT"
 

activestorage/activestorage.gemspec

@@ -9,7 +9,7 @@ Gem::Specification.new do |s|
   s.summary     = "Local and cloud file storage framework."
   s.description = "Attach cloud and local files in Rails applications."
 
-  s.required_ruby_version = ">= 2.2.2"
+  s.required_ruby_version = ">= 2.3.0"
 
   s.license = "MIT"
 

activesupport/activesupport.gemspec

@@ -9,7 +9,7 @@ Gem::Specification.new do |s|
   s.summary     = "A toolkit of support libraries and Ruby core extensions extracted from the Rails framework."
   s.description = "A toolkit of support libraries and Ruby core extensions extracted from the Rails framework. Rich support for multibyte strings, internationalization, time zones, and testing."
 
-  s.required_ruby_version = ">= 2.2.2"
+  s.required_ruby_version = ">= 2.3.0"
 
   s.license = "MIT"
 

rails.gemspec

@@ -9,7 +9,7 @@ Gem::Specification.new do |s|
   s.summary     = "Full-stack web application framework."
   s.description = "Ruby on Rails is a full-stack web framework optimized for programmer happiness and sustainable productivity. It encourages beautiful code by favoring convention over configuration."
 
-  s.required_ruby_version     = ">= 2.2.2"
+  s.required_ruby_version     = ">= 2.3.0"
   s.required_rubygems_version = ">= 1.8.11"
 
   s.license = "MIT"

railties/railties.gemspec

@@ -9,7 +9,7 @@ Gem::Specification.new do |s|
   s.summary     = "Tools for creating, working with, and running Rails applications."
   s.description = "Rails internals: application bootup, plugins, generators, and rake tasks."
 
-  s.required_ruby_version = ">= 2.2.2"
+  s.required_ruby_version = ">= 2.3.0"
 
   s.license = "MIT"