Remove Rails 4 support

.travis.yml

@@ -14,20 +14,9 @@ gemfile:
   - gemfiles/Gemfile.rails-6.0-beta
   - gemfiles/Gemfile.rails-5.2-stable
   - gemfiles/Gemfile.rails-5.0-stable
-  - gemfiles/Gemfile.rails-4.2-stable
-  - gemfiles/Gemfile.rails-4.1-stable
 
 matrix:
   exclude:
-    - rvm: 2.1.10
-      gemfile: Gemfile
-    - rvm: 2.1.10
-      gemfile: gemfiles/Gemfile.rails-6.0-beta
-    - rvm: 2.1.10
-      gemfile: gemfiles/Gemfile.rails-5.2-stable
-    - rvm: 2.1.10
-      gemfile: gemfiles/Gemfile.rails-5.0-stable
-    - rvm: 2.2.10
       gemfile: Gemfile
     - rvm: 2.2.10
       gemfile: gemfiles/Gemfile.rails-6.0-beta
@@ -40,15 +29,6 @@ matrix:
     - rvm: 2.4.5
       gemfile: gemfiles/Gemfile.rails-6.0-beta
     - rvm: 2.5.3
-      gemfile: gemfiles/Gemfile.rails-4.1-stable
-    - rvm: 2.6.0
-      gemfile: gemfiles/Gemfile.rails-4.1-stable
-    - rvm: 2.6.0
-      gemfile: gemfiles/Gemfile.rails-4.2-stable
-    - rvm: ruby-head
-      gemfile: gemfiles/Gemfile.rails-4.1-stable
-    - rvm: ruby-head
-      gemfile: gemfiles/Gemfile.rails-4.2-stable
     - env: DEVISE_ORM=mongoid
       gemfile: Gemfile
     - env: DEVISE_ORM=mongoid
@@ -73,10 +53,7 @@ env:
     - DEVISE_ORM=active_record
     - DEVISE_ORM=mongoid
 
-before_install:
-  - gem uninstall -v '>= 2' -i $(rvm gemdir)@global -ax bundler || true
-  - gem install bundler -v '< 2'
-  - "rm ${BUNDLE_GEMFILE}.lock"
+before_install: "rm ${BUNDLE_GEMFILE}.lock"
 
 before_script: "bundle update"
 

Gemfile.lock

@@ -13,7 +13,7 @@ PATH
     devise (4.6.1)
       bcrypt (~> 3.0)
       orm_adapter (~> 0.1)
-      railties (>= 4.1.0, < 6.0)
+      railties (>= 5.0, < 6.0)
       responders
       warden (~> 1.2.3)
 
@@ -201,4 +201,4 @@ DEPENDENCIES
   webrat (= 0.7.3)
 
 BUNDLED WITH
-   1.17.1
+   1.17.2

README.md

@@ -136,17 +136,17 @@ Please note that the command output will show the variable value being used.
 ### BUNDLE_GEMFILE
 We can use this variable to tell bundler what Gemfile it should use (instead of the one in the current directory).
 Inside the [gemfiles](https://github.com/plataformatec/devise/tree/master/gemfiles) directory, we have one for each version of Rails we support. When you send us a pull request, it may happen that the test suite breaks on Travis using some of them. If that's the case, you can simulate the same environment using the `BUNDLE_GEMFILE` variable.
-For example, if the tests broke using Ruby 2.4.2 and Rails 4.1, you can do the following:
+For example, if the tests broke using Ruby 2.5.0 and Rails 5.0, you can do the following:
 ```bash
-rbenv shell 2.4.2 # or rvm use 2.4.2
-BUNDLE_GEMFILE=gemfiles/Gemfile.rails-4.1-stable bundle install
-BUNDLE_GEMFILE=gemfiles/Gemfile.rails-4.1-stable bin/test
+rbenv shell 2.5.0 # or rvm use 2.5.0
+BUNDLE_GEMFILE=gemfiles/Gemfile.rails-5.0-stable bundle install
+BUNDLE_GEMFILE=gemfiles/Gemfile.rails-5.0-stable bin/test
 ```
 
 You can also combine both of them if the tests broke for Mongoid:
 ```bash
-BUNDLE_GEMFILE=gemfiles/Gemfile.rails-4.1-stable bundle install
-BUNDLE_GEMFILE=gemfiles/Gemfile.rails-4.1-stable DEVISE_ORM=mongoid bin/test
+BUNDLE_GEMFILE=gemfiles/Gemfile.rails-5.0-stable bundle install
+BUNDLE_GEMFILE=gemfiles/Gemfile.rails-5.0-stable DEVISE_ORM=mongoid bin/test
 ```
 
 ### Running tests
@@ -179,7 +179,7 @@ Once you have solidified your understanding of Rails and authentication mechanis
 
 ## Getting started
 
-Devise 4.0 works with Rails 4.1 onwards. Add the following line to your Gemfile:
+Devise 5.0 works with Rails 5.0 onwards. Add the following line to your Gemfile:
 
 ```ruby
 gem 'devise'

devise.gemspec

@@ -17,11 +17,11 @@ Gem::Specification.new do |s|
 
   s.files         = Dir["{app,config,lib}/**/*", "CHANGELOG.md", "MIT-LICENSE", "README.md"]
   s.require_paths = ["lib"]
-  s.required_ruby_version = '>= 2.1.0'
+  s.required_ruby_version = '>= 2.3.0'
 
   s.add_dependency("warden", "~> 1.2.3")
   s.add_dependency("orm_adapter", "~> 0.1")
   s.add_dependency("bcrypt", "~> 3.0")
-  s.add_dependency("railties", ">= 4.1.0", "< 6.0")
+  s.add_dependency("railties", ">= 5.0", "< 6.0")
   s.add_dependency("responders")
 end