Merge pull request #78 from ruby-docx/update_supported_ruby_versions

Update supported ruby versions

Author: satoryu

.travis.yml

@@ -2,8 +2,18 @@ language: ruby
 dist: trusty
 sudo: false
 rvm:
-- 2.4
-- 2.5
+  - 2.4
+  - 2.5
+  - 2.6
+  - 2.7
+  - ruby-head
+
+matrix:
+  allow_failures:
+    - rvm: ruby-head
+
+cache: bundler
 bundler_args: --jobs=2
+
 script:
-- bundle exec rake spec
+  - bundle exec rake spec

docx.gemspec

@@ -11,10 +11,12 @@ Gem::Specification.new do |s|
   s.email       = ['chrahunt@gmail.com']
   s.homepage    = 'https://github.com/chrahunt/docx'
   s.files       = Dir["README.md", "LICENSE.md", "lib/**/*.rb"]
+  s.required_ruby_version = '>= 2.4.0'
 
   s.add_dependency 'nokogiri', '~> 1.10', '>= 1.10.4'
   s.add_dependency 'rubyzip',  '~> 2.0'
 
   s.add_development_dependency 'rspec', '~> 3.7'
   s.add_development_dependency 'rake', '~> 13.0'
 end
+