This release adds a provider for WinSpell: Windows users can now use the
native system spelling checker via Enchant. Many thanks to Moritz Mechelk
for working on this, and the HexChat authors whose code he used.
The change in the previous release to update the tests and require the use
of C++20 have been reverted. I had not realised how old some systems were
that people are still packaging up-to-date Enchant on! We’re back to
requiring C++11.