api.bma.tx.HISTORY_SCHEMA: Unset 'receiving' field as required (#201)

duniterpy/api/bma/tx.py

@@ -36,7 +36,7 @@ HISTORY_SCHEMA = {
                 "receiving": {"$ref": "#/definitions/transactioning_data"},
                 "pending": {"$ref": "#/definitions/transactioning_data"},
             },
-            "required": ["sent", "received", "sending", "receiving", "pending"],
+            "required": ["sent", "received", "sending", "pending"],
         },
     },
     "definitions": {