Please read the release notes at https://github.com/JoinMarket-Org/joinmarket-clientserver/blob/master/docs/release-notes/release-notes-0.6.0.md for details on what this release includes.
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This release includes a bugfix for Qt coinjoins relating to fees, an improved tumbler algorithm, better more intuitive wallet behaviour, and several other more minor changes listed in the release notes.
Erratum: the link for "Amount Formatting" should be to here not the release notes directory, sorry.