Electrum 4.0.4 Release

October 15, 2020

PSBT enhancement: Restored UTXO data inclusion in QR codes, fixing 4.0.3 regression (#6600)
New functionality: “Cancel tx” feature in Qt/Kivy GUI, allowing unconfirmed RBF transaction cancellation via self-double-spend (#6641)
Windows binary improvements:
- Enhanced QR scanning by implementing custom zbar build (#6593)
- Debug binary now included with setup executable installation (#6603)
Ledger optimization: Eliminated “The derivation path is unusual” warnings (#6512) (Requires Bitcoin app version 1.4.8 or later on device)
Additional minor bug fixes and user experience enhancements