Swarmlib

Added
* [landscapes](https://github.com/nathanrooy/landscapesreadme) as a dependency to enable more benchmark functions ([15](https://github.com/HaaLeo/swarmlib/issues/15)). Contributed by Alex F ([alxfmpl](https://github.com/alxfmpl)). Thanks a lot 🚀.

[All Changes](https://github.com/HaaLeo/swarmlib/compare/v0.9.0...v0.10.0)

Added
* _grey wolf optimizer_ ([12](https://github.com/HaaLeo/swarmlib/issues/12)). Perform the grey wolf optimization algorithm on one of the selected 2D-functions. Contributed by Nimish Verma ([NimishVerma](https://github.com/NimishVerma)) and greatly appreciated 🚀.

[All Changes](https://github.com/HaaLeo/swarmlib/compare/v0.8.1...v0.9.0)

Fixed
* a bug that caused the ACO algorithm to fail. Due to other third party packages swarmlib now requires `matplotlib<3.2.0`.

[All Changes](https://github.com/HaaLeo/swarmlib/compare/v0.8.0...v0.8.1)

Added
* the _artificial bee colony_ algorithm. After each step the intermediate solution is plotted.

[All Changes](https://github.com/HaaLeo/swarmlib/compare/v0.7.0...v0.8.0)

Added
* dark mode. It is enabled via the `--dark` flag.

Changed
* `--continuous` and `--interval` flags. Both are now top level flags.
* the API of the ant colony optimization.
* the `tsp_file` argument to an option. Now `--tsp-file` is optional. By default the built-in burma14 problem is used.

[All Changes](https://github.com/HaaLeo/swarmlib/compare/v0.6.2...v0.7.0)

Changed
* cuckoo search visualization: when a nest is abandoned / newly generated color its transition differently.

Fixed
* cuckoo search visualization: now the abandon transition is mapped to the correct nest.

[All Changes](https://github.com/HaaLeo/swarmlib/compare/v0.6.1...v0.6.2)