Merge pull request #776 from JanZerebecki/xmlschema-version

Set minimum version needed for xmlschema

Author: c00kiemon5ter

setup.cfg

@@ -54,7 +54,7 @@ install_requires =
     requests >= 1.0.0
     six
     importlib_resources
-    xmlschema
+    xmlschema >= 1.2.1
 
 
 [options.packages.find]