message: add better description to single branch view
diff: @@ -25,7 +25,7 @@ Features
  --------
  ## Single branch view to focus on your work
  -
  +Select "Show Selected Branch" in the drop down menu above the commit list
  ![Single branch](https://raw.githubusercontent.com/Murmele/Gittyup/master/rsrc/screenshots/main_show_selected_branch.png)
  ## Single line staging
  