Error when reflecting table with TIMESTAMP WITH TIME ZONE type column

[rudolfce]

An error is raised when trying to inspect tables with columns with the timestamptz type

~/Documentos/celero/celerov2-service-ai/env/lib/python3.5/site-packages/sqlalchemy_monetdb/dialect.py in get_columns(self, connection, table_name, schema, **kw)
    178                 args = (row.type_digits, row.type_scale)
    179             col_type = MONETDB_TYPE_MAP.get(row.type, None)
--> 180             col_type = col_type(*args)
    181 
    182             # monetdb translates an AUTO INCREMENT into a sequence

TypeError: 'NoneType' object is not callable

On post-mortem, it is possible to see that the error begins when MONETDB_TYPE_MAP.get(row.type, None) returns None for row.type equals to timestamptz. I created a pull request to try to address this issue

Regards