Depend on Ruby >= 2.4.9

Signed-off-by: Rémy Coutable <remy@rymai.me>

.travis.yml

@@ -1,15 +1,29 @@
+os: linux
+
 language: ruby
-bundler_args: --without development
+
 rvm:
-  - 1.9.3
-  - 2.0.0
-  - 2.1.0
-  - jruby-19mode
-  - rbx
-matrix:
+  - 2.4.9
+  - 2.5.7
+  - 2.6.5
+  - jruby-9.2.8.0
+  - rbx-4.5
+
+jdk:
+  - openjdk8
+
+jobs:
+  fast_finish: true
   allow_failures:
-    - rvm: rbx
-branches:
-  only:
-    - master
-sudo: false
+    - rvm: rbx-4.5
+
+env:
+  global:
+    - JRUBY_OPTS="--debug"
+
+bundler_args: --without development
+
+cache: bundler
+
+script:
+  - bundle exec rake

README.md

@@ -1,11 +1,11 @@
 # Guard::Bundler
 
-[![Gem Version](https://badge.fury.io/rb/guard-bundler.png)](http://badge.fury.io/rb/guard-bundler) [![Build Status](https://travis-ci.org/guard/guard-bundler.png?branch=master)](https://travis-ci.org/guard/guard-bundler) [![Dependency Status](https://gemnasium.com/guard/guard-bundler.png)](https://gemnasium.com/guard/guard-bundler) [![Code Climate](https://codeclimate.com/github/guard/guard-bundler.png)](https://codeclimate.com/github/guard/guard-bundler) [![Coverage Status](https://coveralls.io/repos/guard/guard-bundler/badge.png?branch=master)](https://coveralls.io/r/guard/guard-bundler)
+[![Gem Version](https://badge.fury.io/rb/guard-bundler.png)](http://badge.fury.io/rb/guard-bundler) [![Build Status](https://travis-ci.org/guard/guard-bundler.png?branch=master)](https://travis-ci.org/guard/guard-bundler) [![Code Climate](https://codeclimate.com/github/guard/guard-bundler.png)](https://codeclimate.com/github/guard/guard-bundler) [![Coverage Status](https://coveralls.io/repos/guard/guard-bundler/badge.png?branch=master)](https://coveralls.io/r/guard/guard-bundler)
 
 Bundler guard allows to automatically & intelligently install/update bundle when needed.
 
-* Compatible with Bundler 1.0.x
-* Tested against Ruby 1.9.3, 2.0.0, 2.1.0, JRuby & Rubinius.
+* Compatible with Bundler 2.1.x
+* Tested against the latest Ruby 2.4.x, 2.5.x, 2.6.x, JRuby & Rubinius. See [`.travis-ci.yml`](https://github.com/guard/guard-bundler/blob/master/.travis.yml) for the exact versions.
 
 ## Install
 

guard-bundler.gemspec

@@ -13,7 +13,7 @@ Gem::Specification.new do |s|
   s.summary     = 'Guard gem for Bundler'
   s.description = 'Guard::Bundler automatically install/update your gem bundle when needed'
 
-  s.required_ruby_version = '>= 1.9.2'
+  s.required_ruby_version = '>= 2.4.9'
 
   s.add_dependency 'guard',   '~> 2.2'
   s.add_dependency 'guard-compat', '~> 1.1'