Fix deprecation warning in tests (#268)

Use sqlalchemy.types.LargeBinary instead of Binary

Author: dpep

graphene_sqlalchemy/tests/test_converter.py

@@ -50,7 +50,8 @@ class Model(declarative_base()):
 def test_should_unknown_sqlalchemy_field_raise_exception():
     re_err = "Don't know how to convert the SQLAlchemy field"
     with pytest.raises(Exception, match=re_err):
-        get_field(types.Binary())
+        # support legacy Binary type and subsequent LargeBinary
+        get_field(getattr(types, 'LargeBinary', types.Binary)())
 
 
 def test_should_date_convert_string():