v3.4.0

• implement endpoint api.beatmap_packs()
• implement endpoint api.beatmap_pack()
• add GithubUser.github_username
• fix api.ranking with type="country" erroring
• fix RankingType.CHARTS value. previously spotlight, now charts
• remove User.is_{admin, bng, full_bn, gmt, limited_bn, moderator, nat}
  • these attributes have not been returned from the api in years. Use user.groups instead
• add a user agent header to all requests, in the format ossapi (vx.x.x)
• use correct return type annotation for api.beatmap_user_scores()