Update src/proto/nc_redis.c
Co-authored-by: NTyson Andre <tyson.andre@uwaterloo.ca>

Release twemproxy 0.5.0

Release twemproxy 0.5.0-RC1

See ChangeLog for details.

There have been a lot of changes since 0.4.1 was published in 2015.

I've tested many of these on a fork in combination with the
heartbeat/failover/sentinel patches (planned for 0.6.0)
and expect them to be a significant improvement over 0.4.1,
but there may be build/runtime/packaging issues I'm not aware of on alternate
configurations or OSes.

twemproxy 0.5.0 will use github releases for distribution tarballs

Add miscellaneous tests, fix compilation warnings

Warn about `strdup` being missing during `configure` for libyaml.
(I was checking compatibility with older gcc and should have
used `-std=gnu99`, not `-std=c99`)

Avoid warning about pointer type casts and fallthrough.

Add tests of remaining supported hash functions being compatible with
libmemcached results.

Update unit test for redis/memcache request testing

Closes #543

Update documentation on running tests, config options, etc.

Closes #617

Closes #621

The last ubuntu release that this PPA supported was from 2016
(ubuntu 16.10).
If the ppa receives updates, this can be reverted.

Closes #625
Closes #588

Make error messages starting the stats server clearer

Related to #578

Closes #618

Fix possible crash copying malformed memcache value responses

Closes #436

Update the changelog

Test edge cases of parsing memcache/redis protocol

Support memcache 'version' request, add memcache tests

And update documentation

Avoid warning about implicit loss of precision in clang

Improve single-server pool efficiency, log event backend with version

The computed index would always be 0.

Add const value qualifiers for C functions where applicable