Git-machete

- fixed: in case of red edge, the unique history of a branch never includes commits reachable from its parent

- improved: formatting in `git machete` command prompts and outputs
- added: `slide-out=no` branch qualifier that controls the slide-out behaviour of `git machete traverse`

- improved: docs for `machete.github.*` and other config keys

- fixed: superfluous whitespace around fork point hint in `status`

- fixed: URL prefix for GitHub Enterprise API endpoints

- added: `push=no` and `rebase=no` branch qualifiers that control push and rebase behaviour of `git machete traverse`
- added: `machete.github.domain` config key to support GitHub Enterprise domains
- added: support for per-domain entries in `~/.github-token` file
- fixed: fetching GitHub PRs when there is more than 30 of them in the given repository
- fixed: shell completions suggest `t` (alias for `traverse`) as a valid command