v2.5.0

• Fix Client.beatmaps.getBeatmapAttributes returning mismatch from type definition. Addresses #18.
• Add UserStatisticsVariant interface.
• Add variants property to UserStatistics. Addresses #20.
• Add include_variant_statistics property to GetUsersOptions.query.
• Auth.clientCredentialsGrant now has an optional scopes paramater of type Scope[]. Defaults to ['public'].