Update submodules: parser (new commits)

parser:
    b02cb4d Shane Mc Cormack <shane@dmdirc.com>
            Add support for binding to IPv6 addresses.

            Gerrit: http://gerrit.dmdirc.com/2970

    a7d7379 Shane Mc Cormack <shane@dmdirc.com>
            Let proxies worry about which target to connect to, v4 or v6.

            Gerrit: http://gerrit.dmdirc.com/2971

Change-Id: Ib0873c2a926560436e16564c15ae08a353ab7d91