Update Changes for new release

Signed-off-by: Pedro Melo <melo@simplicidade.org>
Tweak Dist::Zilla config, enable some tests, disable portability for now

Signed-off-by: Pedro Melo <melo@simplicidade.org>
v1.956

    * Add on_connect callback to Redis constructor (issue 28)
    * Make sure quit() doesn't die when the socket is already dead (issue 30);
    * Switch to Digest::SHA, one less non-core dep RT#81841
    * Try and make Travis-CI more useful, ask for a redis-server
    * Update SUPPORT section, moving bugtracker to GitHub issues