When making a constituency Ensemble, save the args used to build it i…

…n the Ensemble itself

stanza/models/constituency/ensemble.py

@@ -56,6 +56,7 @@ def __init__(self, args, filenames=None, models=None, foundation_cache=None):
         """
         super().__init__()
 
+        self.args = args
         if filenames:
             if models:
                 raise ValueError("both filenames and models set when making the Ensemble")