Release v0.3.0

Features
- (tui) Support saving changed values ([#13](https://github.com/orhun/git-cliff/issues/13))
  - Press <kbd>s</kbd> to set a parameter value and also save it to a file.
  - See https://github.com/orhun/systeroid#saving-values
- (tui) Make help list selection functional
  - Press <kbd>enter</kbd> on help menu to run the selected command.
Miscellaneous Tasks
- Bump dependencies
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