Please make it possible to review the changes on a Readme.md file (as a diff) before committing and while doing so please allow to change the commit message. This only affects Readme editing done via the option "Edit README" on the bitbucket repositories main view.
Reconstruction: 1. Opening a repository on bitbucket, where admin rights are granted 2. Click "Edit README" 3. Only SAVE CANCEL and PREVIEW are available as options, neither provide a possibility to see the diff or edit the commit message