fixing project testing

- TypeError: assert_frame_equal() got an unexpected keyword argument 'check_less_precise'
- upgrade requirements.txt for numpy/pandas
- upgrading minimum python version: py3.9+
- other misc changes

scikit-learn = ">=1.0.0"

vs 3.3.1 release

vs 3.3.0 Deprecate PY 2.7, PY <3.7

Upgrading to be more current in PY3, fixing a few nits and bugs.

Release 3.2.2 (#199)

* Fix browser caching of cdn.jsdelivr files.
* update ldavis.js to match ldavis.3.0.0.js

Release 3.2.1 D3.V5 Fix (#198)

Fixing the missing Y-labels issue.

Releases v3.2.0

bumps to v3.1.0

Releases v3.0.0 and copies new js to reflect recent JS changes.

releases v2.1.2