Pastas-plugins

What's Changed
* Improve modflow by dbrakenhoff in https://github.com/pastas/pastas-plugins/pull/8
* Add Edelman response function by martinvonk in https://github.com/pastas/pastas-plugins/pull/9
* Update main to v0.2.0 by martinvonk in https://github.com/pastas/pastas-plugins/pull/11


**Full Changelog**: https://github.com/pastas/pastas-plugins/compare/v0.1.0...v0.2.0

**First release of pastas-plugins**
Contains now four plugins:

1. cross correlation
2. modflow (beta)
3. responses
4. reservoirs (not fully operational)


**Full Changelog**: https://github.com/pastas/pastas-plugins/commits/v0.1.0