Query param to filter out "fee" transactions #137
Description
Bank transactions include a field for fee which can either be:
"BANK""VALIDATOR"""
The blank string means no fee/normal transaction. We need a query param that allows the user to retrieve the results for all non-fee bank transactions.
Example response for GET /bank_transactions - https://gist.github.com/buckyroberts/2365050d1c93da83fff75dd52e387be0
