v2.2.0

[jsanford8]

Additional methods supported:

• Assets.update
• LiveStreams.update
• LiveStreams.get_playback_id
• LiveStreams.updated_embedded_subtitles
• PlaybackRestrictions.create
• PlaybackRestrictions.list
• PlaybackRestrictions.get
• PlaybackRestrictions.delete
• PlaybackRestrictions.update_referrer_domain_restriction
• Exports.list_view_exports

Updated some documentation links that were broken.

[jaredsmith]

I'm not well-versed in Elixir, but this looks fairly straightforward to me.

[jsanford8]

Manually tested all the new routes, too, just for sanity sake. Going to bump version and merge this (fixing the warning)