pin markupsafe

closes #541

Author: deargle

setup.cfg

@@ -22,7 +22,9 @@ install_requires =
   psutil~=5.6.3
   Flask_Login~=0.4.1
   gunicorn[gevent]~=20.0.4
-  Flask~=1.1.1
+  Flask~=1.1.4
+  itsdangerous~=1.1.0
+  markupsafe~=2.0.1
   certifi~=2019.11.28
   pytz~=2019.1
   user_agents~=2.0