Log Message:
Update to 4.0.0. From the changelog:

- **NEW** Feature: `mob reset` doesn't reset the mob branch anymore. It
  now warns you that it deletes the mob branch for everyone and if you
  want to continue do `mob reset --delete-remote-wip-branch`.
- **NEW** Feature: `mob timer`, `mob break`, `mob start`, `mob next` and
  `mob done` will stop already running local timers.
- Feature: `mob start --create` will create the remote branch and start
  the mob session on that branch.
- Feature: mob.sh now also works with tools like `git-repo` which
  symlink the `.git` folder
- Removed `MOB_START_INCLUDE_UNCOMMITTED_CHANGES` environment variable
  (has been deprecated for some time).
- `MOB_DONE_SQUASH` no longer supports a boolean value, you have to use
  the proper values `squash`, `no-squash` or `squash-wip` instead.