Add https support

[msholty-fd]

I've tested this to allow joins and messages and both seem to work. When connecting, you must use wss instead of ws.

I'd like some direction on ways to document how https is supported, so please let me know what form you'd like this in.

[mention-bot]

@msholty-fd, thanks for your PR! By analyzing the history of the files in this pull request, we identified @endel, @Greenkeeper and @greenkeeperio-bot to be potential reviewers.

[endel]

Hey @msholty-fd! Thank you so much for your pull-request!

I've made this change differently, though - reusing the IServerOptions from the @types/uws package, which already accepts https.Server as an argument. The https package remains as an optional dependency.

Please let me know if this fits your needs? Thanks!

PS: I've seen you started a pretty cool project using Colyseus, that's awesome :)

[msholty-fd]

@endel Thanks for the quick response!!

I checked out the most recent version and tested it out. It indeed works for me, without the need for adding a dependency to https. Awesome!