Openmc-plasma-source

What's Changed
* updating citation file version and authors by shimwell in https://github.com/fusion-energy/openmc-plasma-source/pull/44
* Revert matplotlib version to 3.2.2 by LiamPattinson in https://github.com/fusion-energy/openmc-plasma-source/pull/45
* relaxed matplotlib version and added liam to citation by shimwell in https://github.com/fusion-energy/openmc-plasma-source/pull/46


**Full Changelog**: https://github.com/fusion-energy/openmc-plasma-source/compare/v0.2.4...v0.2.5

New Contributors
* LiamPattinson made their first contribution in https://github.com/fusion-energy/openmc-plasma-source/pull/38

**Full Changelog**: https://github.com/fusion-energy/openmc-plasma-source/compare/v0.2.3...v0.2.4

What's Changed
* improved examples by shimwell in https://github.com/fusion-energy/openmc-plasma-source/pull/27
* Adding citation file by shimwell in https://github.com/fusion-energy/openmc-plasma-source/pull/28
* added auto pep formatting by shimwell in https://github.com/fusion-energy/openmc-plasma-source/pull/31
* allowing matplotlib above version 3.2.2 to be installed by shimwell in https://github.com/fusion-energy/openmc-plasma-source/pull/32


**Full Changelog**: https://github.com/fusion-energy/openmc-plasma-source/compare/v0.2.2...v0.2.3

- Angles are now user defined
- Sources strengths are normalised

- Addition of a plotting module
- More flexibility in some classes AI-Pranto
- Minor bug fixes
- Code cleaning mdfaisal98

Extended the type of sources available (added FusionRingSource and FusionPointSource)

Changed the name of Plasma to TokamakSource