Textual-mandelbrot

**Released: 2023-04-15**

- Bumped minimum Textual version to v0.19.1.
- Internal changes.

**Released: 2023-04-03**

- Added bindings to change the "multibrot" value by smaller steps.
- The colour mapping is now configurable at the code level.
- Added key bindings for swapping between the current colour maps.
- Added the calculation time to the `Changed` message and the display.

**Released: 2023-04-02**

- Fixed overly-aggressive caching of the Mandelbrot calculation.
- Added a reset action.
- Cosmetic changes to the UI.
- Improved the key bindings, giving more options (for example, vi and WASD
keys are supported for movement now, also shift+movement moves slower).
- Added "multibrot" support.

**Released: 2023-04-01**

Initial release.

[//]: (ChangeLog.md ends here)