Update release notes markdown for 0.23.1

Author: mattstratton

RELEASE_NOTES.md

@@ -1,22 +1,12 @@
 # Change Log
 
-## [0.23.0](https://github.com/devopsdays/devopsdays-cli/tree/0.23.0) (2018-05-25)
-[Full Changelog](https://github.com/devopsdays/devopsdays-cli/compare/0.22.1...0.23.0)
+## [0.23.1](https://github.com/devopsdays/devopsdays-cli/tree/0.23.1) (2018-05-25)
+[Full Changelog](https://github.com/devopsdays/devopsdays-cli/compare/0.23.0...0.23.1)
 
 **Closed issues:**
 
-- Rename stuttering functions in Event package [\#127](https://github.com/devopsdays/devopsdays-cli/issues/127)
-- Refactor templates to not need to use rice box [\#121](https://github.com/devopsdays/devopsdays-cli/issues/121)
-- Fix 'Duplicate Code' issue in event\event.go [\#117](https://github.com/devopsdays/devopsdays-cli/issues/117)
-- update helpers.ResizeImage to return error code and do something with it here [\#105](https://github.com/devopsdays/devopsdays-cli/issues/105)
-- Create contributing doc [\#36](https://github.com/devopsdays/devopsdays-cli/issues/36)
-- Verify that webdir is valid [\#32](https://github.com/devopsdays/devopsdays-cli/issues/32)
-
-**Merged pull requests:**
-
-- Restructure packages [\#129](https://github.com/devopsdays/devopsdays-cli/pull/129) ([mattstratton](https://github.com/mattstratton))
-- Fix stuttering functions in Event package [\#128](https://github.com/devopsdays/devopsdays-cli/pull/128) ([mattstratton](https://github.com/mattstratton))
-- Quick wins [\#126](https://github.com/devopsdays/devopsdays-cli/pull/126) ([mattstratton](https://github.com/mattstratton))
+- CLI should check to see if it's the latest version [\#124](https://github.com/devopsdays/devopsdays-cli/issues/124)
+- Hugo version check should not use embedded code [\#123](https://github.com/devopsdays/devopsdays-cli/issues/123)