Fixed jinja2 environment autoescape to enable select extensions

Author: mstfbl

.circleci/regenerate.py

@@ -15,6 +15,7 @@
 """
 
 import jinja2
+from jinja2 import select_autoescape
 import yaml
 import os.path
 
@@ -184,7 +185,7 @@ def unittest_workflows(indentation=6):
     env = jinja2.Environment(
         loader=jinja2.FileSystemLoader(d),
         lstrip_blocks=True,
-        autoescape=False,
+        autoescape=select_autoescape(enabled_extensions=('html', 'xml')),
     )
 
     with open(os.path.join(d, 'config.yml'), 'w') as f: