Add TruffleRuby to the test matrix

.travis.yml

@@ -5,12 +5,18 @@ rvm:
   - 2.4.5
   - 2.5.3
   - 2.6.0
+  - truffleruby
 gemfile:
   - gemfiles/rails_4.2.gemfile
   - gemfiles/rails_5.gemfile
   - gemfiles/rails_5.1.gemfile
   - gemfiles/rails_5.2.gemfile
   - gemfiles/sinatra.gemfile
+matrix:
+  exclude:
+    # truffleruby does not seem to work with Rails 4.2
+    - rvm: truffleruby
+      gemfile: gemfiles/rails_4.2.gemfile
 before_install:
   - gem uninstall -v '>= 2' -i $(rvm gemdir)@global -ax bundler || true
   - gem install bundler -v '< 2'

CHANGELOG.md

@@ -11,6 +11,7 @@
 
 * Upgraded dry-validation dependency to dry-schema 1.0 ([#224](https://github.com/railsconfig/config/pull/224))
 * Moved constant to be defined on `Object` instead of `Kernel` ([#227](https://github.com/railsconfig/config/issues/227))
+* Add TruffleRuby to the test matrix ([#229](https://github.com/railsconfig/config/issues/229))
 
 ## 1.7.2
 

README.md

@@ -20,14 +20,15 @@ Config helps you easily manage environment specific settings in an easy and usab
 
 ## Compatibility
 
-* Ruby `>= 2.4`
-* Rails `>= 4.2` and `5`
-* Padrino
-* Sinatra
-
-For Ruby 2.0 to 2.3 or Rails 3 to 4.1 use version `1.x`.
-
-For older versions of Rails or Ruby use [AppConfig](http://github.com/fredwu/app_config).
+* Interpreters
+  * [Ruby](https://www.ruby-lang.org/en/) `>= 2.4`
+  * [TruffleRuby](https://github.com/oracle/truffleruby) `>= 19.0.0`
+* Application frameworks
+  * Rails `>= 4.2` and `5`
+  * Padrino
+  * Sinatra
+
+For Ruby `2.0` to `2.3` or Rails `3` to `4.1` use version `1.x` of this gem. For older versions of Rails or Ruby use [AppConfig](http://github.com/fredwu/app_config).
 
 ## Installing
 

config.gemspec

@@ -27,7 +27,6 @@ Gem::Specification.new do |s|
   s.add_dependency 'deep_merge', '~> 1.2', '>= 1.2.1'
   s.add_dependency 'dry-schema', '~> 1.0'
 
-  s.add_development_dependency 'bundler',     '~> 1.17',  '>= 1.17.3'
   s.add_development_dependency 'rake',        '~> 12.0',  '>= 12.0.0'
 
   # Testing