crunchyroll-rs v0.16.0

• Add {Episode, Series, MovieListing}::categories (#46 by @jokelbaf)
• Add missing fields in NotificationSettings (#47 by @jokelbaf), Episode and Movie
• Make DeviceLocation::city, DeviceLocation::area and SearchEpisode::search_rating optional due to api inconsistencies (#47 by @jokelbaf)
• Make fields of BillingHistory public
• Make SearchEpisode::search_rating optional (#47 by @jokelbaf)
• Change {BrowseOptions, WatchlistOptions}::media_type type to the newly created WatchlistMediaType enum (#48 by @jokelbaf)
• Fix token always refreshing when using inner struct of Search* structs