Add support for ruby-em-pg-client

[Iñaki Baz Castillo]

It would be nice if em-synchrony includes suport for ruby-em-pg-client.

[Ilya Grigorik]

Patches welcome! ;-)

If the API is sane, it shouldn't be a hard thing to add..

[Iñaki Baz Castillo]

Opssss, the library itself includes support for em-synchrony!:

• https://github.com/royaltm/ruby-em-pg-client/blob/master/lib/em-synchrony/pg.rb
• https://github.com/royaltm/ruby-em-pg-client#fibers--em-synchrony