Drop support for old ruby and ruby rails versions ice-cube-ruby#459

Author: sebastienhoorens

.travis.yml

@@ -10,32 +10,12 @@ branches:
   only:
     - master
 rvm:
-  - 1.9.3
-  - 2.0
-  - 2.1.10
-  - 2.2.6
-  - 2.3.3
-  - 2.4.0
+  - 2.3.7
+  - 2.4.4
+  - 2.5.1
   - ruby-head
 env:
-  - RAILS_VERSION='~> 3.2'
   - RAILS_VERSION='~> 4.2'
   - RAILS_VERSION='~> 5.0'
-matrix:
-  exclude:
-
-    # Rails 5 only runs on ruby 2.3 and up
-    - rvm: 1.9.3
-      env: RAILS_VERSION='~> 5.0'
-    - rvm: 2.0
-      env: RAILS_VERSION='~> 5.0'
-    - rvm: 2.1.10
-      env: RAILS_VERSION='~> 5.0'
-    - rvm: 2.2.6
-      env: RAILS_VERSION='~> 5.0'
-
-    # Rails 3 no longer runs on ruby 2.4 and up
-    - rvm: 2.4.0
-      env: RAILS_VERSION='~> 3.2'
-    - rvm: ruby-head
-      env: RAILS_VERSION='~> 3.2'
+  - RAILS_VERSION='~> 5.1'
+  - RAILS_VERSION='~> 5.2'

Gemfile

@@ -1,11 +1,5 @@
 source 'https://rubygems.org'
 gemspec
 
-compatible_rails_versions = [
-  '>= 3.0.0',
-  ('<5' if Gem::Version.new(RUBY_VERSION) < Gem::Version.new('2.2.2'))
-].compact
-
-gem 'activesupport', (ENV['RAILS_VERSION'] || compatible_rails_versions), require: false
+gem 'activesupport', (ENV['RAILS_VERSION'] || '>= 4.2'), require: false
 gem 'i18n', require: false
-gem 'tzinfo', require: false # only needed explicitly for RAILS_VERSION=3

ice_cube.gemspec

@@ -1,4 +1,3 @@
-# encoding: utf-8
 lib = File.expand_path('../lib', __FILE__)
 $LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
 require 'ice_cube/version'
@@ -15,9 +14,7 @@ Gem::Specification.new do |s|
   s.version       = IceCube::VERSION
   s.platform      = Gem::Platform::RUBY
   s.files         = Dir['lib/**/*.rb', 'config/**/*.yml']
-  s.test_files    = Dir.glob('spec/*.rb')
   s.require_paths = ['lib']
-  s.has_rdoc      = true
 
   s.add_development_dependency('rake')
   s.add_development_dependency('rspec', '> 3')