pin python-dateutil dependency
to an old version that doesn't break tests
@@ -36,6 +36,7 @@ pillow==4.0.0 # PIL Software License:
psycogreen==1.0 # BSD
psycopg2==2.7.3 # LGPL with exceptions or ZPL
pycountry==1.20 # LGPL 2.1
+python-dateutil==2.8.0 # Apache 2.0
PyJWE==1.0.0 # Apache 2.0
pyyaml==3.11 # MIT
raven==6.1.0 # BSD
