Test on Rails {4.2,5.{0,1}} on Ruby 2.{2,3,4}

.gitignore

@@ -4,6 +4,7 @@
 .ruby-version
 .bundle
 Gemfile.lock
+gemfiles/*.lock
 html
 pkg
 .idea

.travis.yml

@@ -1,6 +1,17 @@
+rvm:
+  - 2.2
+  - 2.3
+  - 2.4
+
+gemfile:
+  - gemfiles/rails_4.2.gemfile
+  - gemfiles/rails_5.0.gemfile
+  - gemfiles/rails_5.1.gemfile
+
+matrix:
+  exclude:
+    - rvm: 2.4
+      gemfile: gemfiles/rails_4.2.gemfile
+
 language: ruby
 cache: bundler
-rvm:
-  - 2.1.2
-  - 2.0.0
-  - 1.9.3

gemfiles/rails_4.2.gemfile

@@ -0,0 +1,5 @@
+source "https://rubygems.org"
+
+gem "rails", "~> 4.2.0"
+
+gemspec :path => "../"

gemfiles/rails_5.0.gemfile

@@ -0,0 +1,5 @@
+source "https://rubygems.org"
+
+gem "rails", "~> 5.0.0"
+
+gemspec :path => "../"

gemfiles/rails_5.1.gemfile

@@ -0,0 +1,5 @@
+source "https://rubygems.org"
+
+gem "rails", "~> 5.1.0"
+
+gemspec :path => "../"

sanitize-rails.gemspec

@@ -17,6 +17,6 @@ Gem::Specification.new do |s|
   s.require_paths = ["lib"]
   s.files         = `git ls-files`.split("\n")
 
-  s.add_dependency "rails",    ">= 3.0"
-  s.add_dependency "sanitize", ">= 3.0"
+  s.add_dependency "rails"
+  s.add_dependency "sanitize"
 end