Validate query arguments against graphql name not python name

Author: XuluWarrior

sgqlc/codegen/operation.py

@@ -456,9 +456,9 @@ def validate_required_arguments(self, node):
             if a['type']['kind'] == 'NON_NULL' and a['defaultValue'] is None:
                 required.add(a['name'])
 
-        for name, _ in node.arguments:
-            if name in required:
-                required.remove(name)
+        for _, var in node.arguments:
+            if var.name in required:
+                required.remove(var.name)
 
         if required:
             raise ValueError(