drop ruby 1.9.3 support; add ruby 2.3.0 support

.travis.yml

@@ -4,10 +4,10 @@ cache:
 install:
 - bundle install
 rvm:
-- 1.9.3
 - 2.0
 - 2.1
 - 2.2
+- 2.3.0
 notifications:
   email:
     recipients:
@@ -26,8 +26,8 @@ deploy:
   on:
     tags: true
     all_branches: true
-    rvm: 1.9.3
     rvm: 2.0
     rvm: 2.1
     rvm: 2.2
+    rvm: 2.3.0
     repo: sensu-plugins/sensu-plugins-redis

sensu-plugins-redis.gemspec

@@ -3,11 +3,7 @@ $LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
 
 require 'date'
 
-if RUBY_VERSION < '2.0.0'
-  require 'sensu-plugins-redis'
-else
-  require_relative 'lib/sensu-plugins-redis'
-end
+require_relative 'lib/sensu-plugins-redis'
 
 Gem::Specification.new do |s|
   s.authors                = ['Sensu-Plugins and contributors']
@@ -23,7 +19,7 @@ Gem::Specification.new do |s|
   s.executables            = Dir.glob('bin/**/*.rb').map { |file| File.basename(file) }
   s.homepage               = 'https://github.com/sensu-plugins/sensu-plugins-redis'
   s.license                = 'MIT'
-  s.metadata               = { 'maintainer'         => '@mattyjones',
+  s.metadata               = { 'maintainer'         => 'sensu-plugin',
                                'development_status' => 'active',
                                'production_status'  => 'unstable - testing recommended',
                                'release_draft'      => 'false',
@@ -32,7 +28,7 @@ Gem::Specification.new do |s|
   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  = '>= 1.9.3'
+  s.required_ruby_version  = '>= 2.0.0'
 
   s.summary                = 'Sensu plugins for working with redis'
   s.test_files             = s.files.grep(%r{^(test|spec|features)/})