Inconcistent Changes output types

[LordMike]

From @mpfc75:

Thanks for your reply. GetMovieChangesAsync returns Task<IList<Change>> GetTvEpisodeChangesAsync returns Task<IList<Change>> GetTvSeasonChangesAsync returns Task<IList<Change>>

GetTvShowChangesAsync returns Task<ChangesContainer> (not IList).

These could all be of one form - as ChangesContainer wraps a List<Change>.