add Ruby 2.3.0 support; remove 1.9.3 and 2.0

Author: eheydrick

.travis.yml

@@ -4,10 +4,9 @@ cache:
 install:
 - bundle install
 rvm:
-- 1.9.3
-- 2.0
 - 2.1
 - 2.2
+- 2.3.0
 notifications:
   email:
     recipients:
@@ -26,8 +25,7 @@ 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-postgres

sensu-plugins-postgres.gemspec

@@ -2,12 +2,7 @@ lib = File.expand_path('../lib', __FILE__)
 $LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
 
 require 'date'
-
-if RUBY_VERSION < '2.0.0'
-  require 'sensu-plugins-postgres'
-else
-  require_relative 'lib/sensu-plugins-postgres'
-end
+require_relative 'lib/sensu-plugins-postgres'
 
 Gem::Specification.new do |s|
   s.authors                = ['Sensu-Plugins and contributors']
@@ -33,7 +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  = '>= 2.1.0'
 
   s.summary                = 'Sensu plugins for postgres'
   s.test_files             = s.files.grep(%r{^(test|spec|features)/})