Update hacking dependency

Sync with openstack global requirements for hacking. This allows us to
properly use pbr 2.0.0.

Change-Id: Ia20a1d743e34641e1ff1719e8527f1ee67c8ab3e
Signed-off-by: Paul Belanger <pabelanger@redhat.com>
(cherry picked from commit 7641d8046253e4f678793c13c998e427c4af1da2)
1 file changed