Add note about how to release

Signed-off-by: Matt Stratton <matt.stratton@gmail.com>

Author: mattstratton

README.e.md

@@ -79,7 +79,6 @@ See [CONTRIBUTING.md](contributing.md) for details on how to contribute to this
 # How to release
 
 ```sh
-$ changelog prepare
 $ gump <patch|minor|major>
 ```