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)
diff --git a/test-requirements.txt b/test-requirements.txt
index 39ecf62..e43b7a1 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -1,4 +1,4 @@
-hacking>=0.9.2,<0.10
+hacking>=0.12.0,!=0.13.0,<0.14  # Apache-2.0
 
 coverage>=3.6
 sphinx>=1.1.2,!=1.2.0,!=1.3b1,<1.3