0.5 PyPI release update

What's Changed

• packaging and documentation updates by @epogrebnyak in #8
• Readme for course files by @epogrebnyak in #9
• Bump jinja2 from 2.11.2 to 2.11.3 by @dependabot in #18
• Bump pillow from 7.2.0 to 8.1.1 by @dependabot in #17
• Bump pygments from 2.7.1 to 2.7.4 by @dependabot in #19
• Bump urllib3 from 1.25.10 to 1.26.5 by @dependabot in #21
• Bump pillow from 8.1.1 to 8.2.0 by @dependabot in #22
• Add 'format" para into datetime_to_float by @lyh710 in #24
• Bump pillow from 8.2.0 to 8.3.2 by @dependabot in #25
• Bump babel from 2.8.0 to 2.9.1 by @dependabot in #26
• Fix matrix_lendingclub.py by @KonScanner in #29
• Fix matrix_from_duration_data.py by @KonScanner in #28
• Fix matrix_from_cohord_data.py by @KonScanner in #27
• Bump pillow from 8.3.2 to 9.0.0 by @dependabot in #31
• Bump numpy from 1.20.2 to 1.21.0 by @dependabot in #32
• Update requirements.txt for python3.9 or greater by @KonScanner in #30
• Bump urllib3 from 1.25.11 to 1.26.5 by @dependabot in #33

New Contributors

• @epogrebnyak made their first contribution in #8
• @dependabot made their first contribution in #18
• @lyh710 made their first contribution in #24
• @KonScanner made their first contribution in #29

Full Changelog: https://github.com/open-risk/transitionMatrix/commits/v0.5.0-alpha