Update README.md to remove myself as a member of the WG

Author: jlmitch5

README.md

@@ -259,7 +259,6 @@ about the expectations for all contributors to this project.
 
 - Hans Kristian Flaatten ([starefossen](https://github.com/starefossen))
 - Hugues Malphettes ([hmalphettes](https://github.com/hmalphettes))
-- John Mitchell ([jlmitch5](https://github.com/jlmitch5))
 
 ### Docker Working Group Collaborators