Announcing network-2.6.3.2

This release includes many improvements to documentation and infrastructure as well as a few API additions. As always a huge thank you to the network contributors.

Version 2.6.3.2

 * Zero memory of `sockaddr_un` if abstract socket
   [#220](https://github.com/haskell/network/pull/220)

 * Improving error messages
   [#232](https://github.com/haskell/network/pull/232)

 * Allow non-blocking file descriptors via `setNonBlockIfNeeded`
   [#242](https://github.com/haskell/network/pull/242)

 * Update config.{guess,sub} to latest version
   [#244](https://github.com/haskell/network/pull/244)

 * Rename `my_inet_ntoa` to avoid symbol conflicts
   [#228](https://github.com/haskell/network/pull/228)

 * Test infrastructure improvements
   [#219](https://github.com/haskell/network/pull/219)
   [#217](https://github.com/haskell/network/pull/217)
   [#218](https://github.com/haskell/network/pull/218)

 * House keeping and cleanup
   [#238](https://github.com/haskell/network/pull/238)
   [#237](https://github.com/haskell/network/pull/237)