- remove jupyter_contrib_nbextensions package from environment.yml as this is no longer supported
- update the version in the setup.py file so when installing locally it has v20 associated with it
- remove download link from the setup.py file since it's not correct for the beta
- change the name of the environment to `python-awips-beta20`
- remove the python-awips package from the environment, because it needs to be installed from the local source code
- change collections import to collections.abc
- change specific class reference from collections.[class_name] to collections.abc.[class_name]
- change environment file back to specifying Python3, instead of exactly specifying 3.9
- roll version number in setup.py
