Update the outdated URL in HACKING.rst

Change-Id: Icd912e34d19a2a748193f76abe531f8b5f58e8f4
diff --git a/HACKING.rst b/HACKING.rst
index ca7b5cd..eac83a4 100644
--- a/HACKING.rst
+++ b/HACKING.rst
@@ -1,4 +1,4 @@
 ironic-tempest-plugin Style Commandments
 ===============================================
 
-Read the OpenStack Style Commandments http://docs.openstack.org/developer/hacking/
+Read the OpenStack Style Commandments https://docs.openstack.org/hacking/latest/