v1.8.9
* Work around some Protonmail-specific (mis)behavior with messages References; add some tests
* Fix probleem with mu4e~view-message being nillified when it shouldn't.
v1.8.8
* Update mu4e-action-add-org-contact for new contact format
* Ensure non-nil works (rather than only t) in mu4e-server
* Add some more unit tests for skipdups / related messages.