Update markupsafe from 0.23 to 1.0

Author: pyup-bot

project/requirements/base.txt

@@ -2,7 +2,7 @@
 django==1.8.5
 Jinja2==2.9.6
 django-jinja==2.3.0
-markupsafe==0.23
+markupsafe==1.0
 
 # Configuration
 django-environ==0.4.1