Updated from global requirements

Change-Id: Ic26729d1ce6e367d1b1cff38f6802cfed0d509ec

Author: OpenStack Proposal Bot

requirements.txt

@@ -4,7 +4,7 @@
 pbr>=1.6 # Apache-2.0
 six>=1.9.0 # MIT
 
-Babel!=2.3.0,!=2.3.1,!=2.3.2,!=2.3.3,>=1.3 # BSD
+Babel>=2.3.4 # BSD
 cliff!=1.16.0,!=1.17.0,>=1.15.0 # Apache-2.0
 keystoneauth1>=2.1.0 # Apache-2.0
 openstacksdk>=0.8.5 # Apache-2.0