chore(requirements): update pytz to 2016.6.1

Author: helgi

rootfs/requirements.txt

@@ -11,7 +11,7 @@ morph==0.1.2
 ndg-httpsclient==0.4.1
 psycopg2==2.6.2
 pyOpenSSL==16.0.0
-pytz==2016.4
+pytz==2016.6.1
 ruamel.yaml==0.11.14
 requests==2.10.0
 requests-toolbelt==0.6.2