Merge "Bump lower constraint of MarkupSafe"

Author: Zuul

lower-constraints.txt

@@ -41,7 +41,7 @@ jsonschema==2.6.0
 keystoneauth1==3.14.0
 kombu==4.0.0
 linecache2==1.0.0
-MarkupSafe==1.0
+MarkupSafe==1.1.0
 mccabe==0.2.1
 mock==2.0.0
 monotonic==0.6