Remove unnecessary comma.

Shammamah Hossain · Shammamah Hossain · commit db2230be7295 · 2019-06-20T17:54:17.000-04:00
diff --git a/dash/development/_py_components_generation.py b/dash/development/_py_components_generation.py
@@ -521,7 +521,7 @@ def shape_or_exact():
         # React's PropTypes.shape
         shape=shape_or_exact,
         # React's PropTypes.exact
-        exact=shape_or_exact,
+        exact=shape_or_exact
     )
 
 
