Feature request: Ignore memo-field

[Tuphal]

A setting to ignore the memo-field would be perfect.
After importing, the memo field is always used with more or less usefull information.
I'd like to have it empty and fill it by myself if needed.

Current working workaround for me:
In file ynab.py in line 18:
old: memo = transaction.memo[:199] if transaction.memo else None,
new: memo = None,