Chama

What's Changed
* Updates to support Pandas 2.0 and test against additional versions of Python by kaklise in https://github.com/sandialabs/chama/pull/33

**Full Changelog**: https://github.com/sandialabs/chama/compare/v0.2.0...v0.3.0

* Bug fix in type checking for impact assessment dataframes
* Changes to account for updates in Pyomo and Pandas
* Added GitHub Actions for tests
* Dropped Python 3.5 and 3.6 tests, added Python 3.8 and 3.9 tests
* Added a Gaussian plume and water network example

**Full Changelog**: https://github.com/sandialabs/chama/compare/v0.1.3...v0.2.0

* Updated methods to be compatible with Pandas 1.0
* Added required dependencies to setup.py
* Dropped Python 2.7 tests
* Updated documentation