Release for v1.3.1

1. Taking out transition code to increase memory allocation
2. Adding parallelization for land type kernel density processing
3. Adding script to write ncdfs using xarray based on inputs in config file
4. Adding testing script for new users
5. Making reading in region, basin mapping file parameterzied so users can read in their own region, basin mapping file
6. Changes to code cov yml along with addition of badge.
7. Changes to setup.py (New package dependencies, bumping up python version)
8. Addition of demeter 1.3.1 workflow which accounts for all changes above.
9. Adding new docs generated using sphinx