shut down Gitter room?

[SethTisue]

it's not active, and it's one more thing to keep an eye on.

I suggest we delete the room and the reference in the repo readme

wdyt @Philippus?

[Philippus]

good idea!

[SethTisue]

I put an impending-shutdown notice in the room itself at https://gitter.im/scala/scala-parser-combinators?at=5d238d06cdb70805c95ec0ff

[SethTisue]

no more room! 💥

here's a log of what was there: https://gist.github.com/SethTisue/58d9f3e60b4797d9331c96ce695ca327