No upstream changelog for UCD itself, but updated for new Unicode 11.0:
http://blog.unicode.org/2018/06/announcing-unicode-standard-version-110.html.
Announcing The Unicode(R) Standard, Version 11.0
Version 11.0 of the Unicode Standard is now available, both the core
specification and data files.
Version 11.0 adds 684 characters, for a total of 137,374 characters.
These additions include seven new scripts, for a total of 146 scripts,
as well as 145 new emoji.
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