update plugin to support recent changes on Uniswap

[tdejoigny-ledger]

• add sweep method support (widely used now)
• display unwrap amount instead of exact in output amount
• remove check (code and test) for the output amount of exact in which can be equal to 0
• drop an extra parameter added recently in the call data (to track the transaction coming from Uniswap frontend but useless for the plugin)
• remove a check in the tx content which assert value == 0
• update the fields wording
• update the golden snapshots

[fbeutin-ledger]

Superseeded #22