[electrum] bump version to 5.4.2 and add release notes
Summary: as per title
Test Plan: python setup.py --version
Reviewers: #bitcoin_abc, Fabien
Reviewed By: #bitcoin_abc, Fabien
Differential Revision: https://reviews.bitcoinabc.org/D17858
[electrum] bump version to 5.4.2 and add release notes Tags None Subscribers None
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