Replace pypi version badge badge.fury.io -> img.shields.io badge was blocked by privacy badger due to third party cookie. Replace with one that doesn't use cookies. Also add some other badges I may want to implement: supported python versions licenses used status beta, stable etc. mozilla observatory

# human timezones
pytz
# indexer
Whoosh
# extra database support
psycopg2
mysqlclient
# encryption
gpg
# java web tokens
PyJWT
# extra HTTP compression methods
Brotli
zstd