prep for 4.0.0 release

Author: majormoses

CHANGELOG.md

@@ -5,9 +5,10 @@ This CHANGELOG follows the format listed [here](https://github.com/sensu-plugins
 
 ## [Unreleased]
 
+## [4.0.0] - 2019-03-17
 ### Breaking Changes
-- Bump sensu-plugin version from `~> 2.0` to `~> 4.0` for Sensu 1.x to Sensu Go event conversion you can read the changelog entries for [4.0](https://github.com/sensu-plugins/sensu-plugin/blob/master/CHANGELOG.md#400---2018-02-17) and [3.0](https://github.com/sensu-plugins/sensu-plugin/blob/master/CHANGELOG.md#300---2018-12-04)
-- drop support and testing for ruby 2.1 and 2.2 as they are EOL
+- Bump sensu-plugin version from `~> 2.0` to `~> 4.0` for Sensu 1.x to Sensu Go event conversion you can read the changelog entries for [4.0](https://github.com/sensu-plugins/sensu-plugin/blob/master/CHANGELOG.md#400---2018-02-17) and [3.0](https://github.com/sensu-plugins/sensu-plugin/blob/master/CHANGELOG.md#300---2018-12-04) (@asachs01)
+- drop support and testing for ruby 2.1 and 2.2 as they are EOL (@asachs01)
 
 ## [3.0.0] - 2018-12-07
 ### Breaking Changes

lib/sensu-plugins-mailer/version.rb

@@ -1,6 +1,6 @@
 module SensuPluginsMailer
   module Version
-    MAJOR = 3
+    MAJOR = 4
     MINOR = 0
     PATCH = 0