Update submodules: parser (new commits)

parser:
    591a91c Chris Smith <chris@dmdirc.com>
            Push some logic into BaseSocketAwareParser.

            Make IRCParser extend the BSAP, and use that for creating new
            sockets that respect bind IP/proxy settings.

            Gerrit: http://gerrit.dmdirc.com/3973

Change-Id: Ica1dc7cc68782a26e2639fc1698731e42f8aa760