Changelog for http2-client

Unreleased changes

v0.10.0.0

• Export frameHttp2RawConnection to convert an RawHttp2Connection into an Http2FrameConnection.
• Add newRawHttp2ConnectionUnix to create a RawHttp2Connection from a unix domain socket.

v0.9.0.0

• introduce ClientIO as an error-carrying IO-monad for performing http2-calls

v0.8.0.2

• first Changelog!
• performance improvement: use TCP_NODELAY
• performance improvement: change stream-initialization functions to make less work under the HEADER-protection lock