Remove support for ruby-2.1.0 (#57)

* Remove support for ruby-2.1.0

Author: phumpal

.travis.yml

@@ -5,13 +5,10 @@ cache:
 - bundler
 before_install:
   - sudo iptables -L DOCKER || ( echo "DOCKER iptables chain missing" ; sudo iptables -N DOCKER )
-  - gem install bundler -v 1.15
+  - gem install bundler -v 1.15.1
 install:
 - bundle install
 rvm:
-- 2.1
-- 2.2
-- 2.3.0
 - 2.4.1
 notifications:
   email:
@@ -35,8 +32,5 @@ deploy:
   on:
     tags: true
     all_branches: true
-    rvm: 2.1
-    rvm: 2.2
-    rvm: 2.3.0
     rvm: 2.4.1
     repo: sensu-plugins/sensu-plugins-postgres

CHANGELOG.md

@@ -4,6 +4,8 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 This CHANGELOG follows the format listed [here](https://github.com/sensu-plugins/community/blob/master/HOW_WE_CHANGELOG.md).
 
 ## [Unreleased]
+### Breaking changes
+- Remove unsupported Rubies: 2.1, 2.2, 2.3
 
 ## [1.4.6] - 2018-05-03
 ### Fixed

sensu-plugins-postgres.gemspec

@@ -28,7 +28,7 @@ Gem::Specification.new do |s| # rubocop:disable Metrics/BlockLength
   s.platform               = Gem::Platform::RUBY
   s.post_install_message   = 'You can use the embedded Ruby by setting EMBEDDED_RUBY=true in /etc/default/sensu'
   s.require_paths          = ['lib']
-  s.required_ruby_version  = '>= 2.1.0'
+  s.required_ruby_version  = '>= 2.4.1'
 
   s.summary                = 'Sensu plugins for postgres'
   s.test_files             = s.files.grep(%r{^(test|spec|features)/})