Update release notes markdown for 0.24.0

Author: mattstratton

RELEASE_NOTES.md

@@ -1,13 +1,5 @@
 # Change Log
 
-## [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:**
-
-- 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)
-
 
 
 \* *This Change Log was automatically generated by [github_changelog_generator](https://github.com/skywinder/Github-Changelog-Generator)*