prep for 2.9.0 release

Author: majormoses

CHANGELOG.md

@@ -5,6 +5,7 @@ This CHANGELOG follows the format listed at [Our CHANGELOG Guidelines ](https://
 Which is based on [Keep A Changelog](http://keepachangelog.com/)
 
 ## [Unreleased]
+## [2.9.0] - 2018-08-24
 ### Changed
 - updated check: `powershell/check-windows-disk-writeable.ps1` now using CIM instead of WMI for large performance gain (@csabo)
 - updated check: `powershell/check-windows-disk.ps1` now using CIM instead of WMI for large performance gain (@csabo)
@@ -184,7 +185,8 @@ Which is based on [Keep A Changelog](http://keepachangelog.com/)
 ### Added
 - Initial release
 
-[Unreleased]: https://github.com/sensu-plugins/sensu-plugins-Windows/compare/2.8.1...HEAD
+[Unreleased]: https://github.com/sensu-plugins/sensu-plugins-Windows/compare/2.9.0...HEAD
+[2.9.0]: https://github.com/sensu-plugins/sensu-plugins-Windows/compare/2.8.1...2.9.0
 [2.8.1]: https://github.com/sensu-plugins/sensu-plugins-Windows/compare/2.8.0...2.8.1
 [2.8.0]: https://github.com/sensu-plugins/sensu-plugins-Windows/compare/2.7.0...2.8.0
 [2.7.0]: https://github.com/sensu-plugins/sensu-plugins-Windows/compare/2.6.0...2.7.0

lib/sensu-plugins-windows/version.rb

@@ -1,8 +1,8 @@
 module SensuPluginsWindows
   module Version
     MAJOR = 2
-    MINOR = 8
-    PATCH = 1
+    MINOR = 9
+    PATCH = 0
 
     VER_STRING = [MAJOR, MINOR, PATCH].compact.join('.')
   end