Update to hacking 3.0
Hacking 3.0 was just released with minor changes, update to the new
version.
Change-Id: I8153c333e8e65cd9469e490a2841a691a269303c
diff --git a/test-requirements.txt b/test-requirements.txt
index b986009..38b72d1 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -2,7 +2,7 @@
# of appearance. Changing the order has an impact on the overall integration
# process, which may cause wedges in the gate later.
-hacking>=2.0,<2.1 # Apache-2.0
+hacking>=3.0,<3.1.0 # Apache-2.0
coverage!=4.4,>=4.0 # Apache-2.0
oslosphinx>=4.7.0 # Apache-2.0