docs: update SKLL version in README

docs: update requirements in README.

Merge pull request #663 from EducationalTestingService/release/11.2.0

Release/11.2.0

fix: use `sphinx_rtd_theme` correctly in docs.

add Python 3.11 and update conda build number

fix typo

Merge pull request #607 from EducationalTestingService/Small-modifica…

…tions-on-readMe

Add shap as a requirement to the README

Update MANIFEST.in to include requirements.txt.

Update RTD yaml to drop Python 3.7.

Merge pull request #566 from EducationalTestingService/release/v9.0

Release/v9.0

v8.1.2 Release