Update changelog and .cabal for 1.2.3.0

Update for network 3.0

io-streams 1.5 bugfix.

Bump for io-streams 1.5.

Version 1.2.1.1.

Upgrade io-streams dependency to 1.3 for bytestring-builder conversion.

Make sure that we ask for TCP during connect and in the test suite!

Update network dep to allow version 2.5.*.

Bump version, add changelog

Add Setup.hs