New Features / Improvements

• Revamp authentication interface
  • Add support for OAuth 2.0 Authorization Code Flow with PKCE
    • Add OAuth2UserHandler (2b83507, 16763e2)
    • Add user_auth parameters to Client methods (8f38429, e88b074, 0d6b68a)
  • Rename OAuthHandler to OAuth1UserHandler (fb6eb7d)
    • OAuthHandler is kept as a deprecated alias (cba7317)
  • Rename AppAuthHandler to Oauth2AppHandler (529d793)
    • AppAuthHandler is kept as a deprecated alias (d4ceb1a)
  • Rename OAuth2Bearer to OAuth2BearerHandler (0781fde)
  • Allow passing access token and secret directly to OAuth1UserHandler.__init__ (99f3583)
    • Note, this changes the callback parameter to be the fifth argument, positionally
  • Allow OAuth2BearerHandler to be used as auth parameter for API (5a2a3fc)
  • Remove AuthHandler (d600c4c)
  • Remove OAuth1UserHandler.get_xauth_access_token (8e2de9f)
  • Update and improve authentication documentation (f9a722b)
  • Other improvements and optimizations
• Add Client.get_me (c49cbdf, 62b5b58, f6895d3, bb87b26)
• Add support for Media.url (#1722)
• Use requests exception to handle JSONDecodeError (b492b0a)
  • Update requests dependency requirement to >= 2.27.0 (ed66e8e)

Bug Fixes

• Fix Response.includes["polls"] not being Poll objects (#1733)
• Fix Paginator handling of Client.get_all_tweets_count (#1761)

Misc

• Improve and optimize Model.__getstate__ (#1707)
• Add API v2 examples to documentation (bbdbb7b)
• Update and improve various documentation