add support for requested_reviewrs and draft

[DayBySay]

Add requested_reviewers and draft parameters for PullRequest class. https://docs.github.com/en/rest/reference/pulls#reviews

Fix state in Review based on https://docs.github.com/en/graphql/reference/enums#pullrequestreviewstate

[codecov-io]

Codecov Report

Merging #123 (2fc0045) into master (9521cdf) will not change coverage. The diff coverage is n/a.

@@      Coverage Diff      @@
##   master   #123   +/-   ##
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[pietbrauer]

Thanks a lot!