* Update deps, fix test warnings.
* Support ns2.0
* Fix typo
* Remove ns1.1 support
* Net.Http and Net.Websockets.Client are not needed in ns2.0
* Move to net46 per volt
* Remove ns1.3 constants
* Changed Guild#DefaultChannel to resolve the first accessible channel
Resolves#776
This change is inline with hammerandchisel/discord-api-docs#329
RestGuild#DefaultChannelId is now obsolete and will throw a
NotSupportedException.
* RestGuild#DefaultChannelId will fall back to the guild ID
Adding an exception here would be a breaking change, so this was agreed
to fall back to the previous behavior, which would just return the guild
ID.
