Drop support ruby 2.0 and 2.1

.travis.yml

@@ -1,8 +1,6 @@
 language: ruby
 rvm:
-- 2.0
-- 2.1
-- 2.2
+- 2.2.2
 - 2.3.2
 - ruby-head
 bundler_args: "--jobs=2"

Gemfile

@@ -3,22 +3,6 @@ source "https://rubygems.org"
 # Specify your gem's dependencies in rubicure.gemspec
 gemspec
 
-if Gem::Version.create(RUBY_VERSION) < Gem::Version.create("2.1.0")
-  # NOTE: build is failed when use ruby 2.0 and rspec-parameterized 0.3.0+
-  #   https://travis-ci.org/sue445/rubicure/jobs/114266855
-  gem "rspec-parameterized", "< 0.3.0", group: :test
-end
-
-if Gem::Version.create(RUBY_VERSION) < Gem::Version.create("2.1.0")
-  # NOTE: unparser v0.2.5 drop support ruby < 2.1
-  gem "unparser", "< 0.2.5", group: :test
-end
-
-if Gem::Version.create(RUBY_VERSION) < Gem::Version.create("2.2.2")
-  # NOTE: activesupport 5.x supports only ruby 2.2.2+
-  gem "activesupport", ">= 4.0.0", "< 5.0.0"
-end
-
 if Gem::Version.create(RUBY_VERSION) < Gem::Version.create("2.3.0")
   gem "backport_dig"
 end

README.md

@@ -22,7 +22,7 @@ Inspired by [Acme::PrettyCure](http://perl-users.jp/articles/advent-calendar/201
 
 ## Requirements
 
-* ruby >= 2.0.0
+* ruby >= 2.2.2
   * more: [.travis.yml](.travis.yml)
 
 ## Installation
@@ -32,7 +32,7 @@ Add this line to your application's Gemfile:
 ```ruby
 gem 'rubicure'
 
-# for ruby 2.0, 2.1, 2.2
+# for ruby 2.2
 gem 'backport_dig'
 ```
 

rubicure.gemspec

@@ -13,14 +13,14 @@ Gem::Specification.new do |spec|
   spec.homepage      = "https://github.com/sue445/rubicure"
   spec.license       = "MIT"
 
-  spec.required_ruby_version = ">= 2.0.0"
+  spec.required_ruby_version = ">= 2.2.2"
 
   spec.files         = `git ls-files`.split($INPUT_RECORD_SEPARATOR)
   spec.executables   = spec.files.grep(%r{^bin/}) { |f| File.basename(f) }
   spec.test_files    = spec.files.grep(%r{^(test|spec|features)/})
   spec.require_paths = ["lib"]
 
-  spec.add_dependency "activesupport", ">= 4.0.0"
+  spec.add_dependency "activesupport", ">= 5.0.0"
   spec.add_dependency "hashie", ">= 2.0.5"
   spec.add_dependency "sengiri_yaml", ">= 0.0.2"