Unicode® ICU 64 has just been released. It updates to Unicode 12 and to CLDR 35 locale data with many additions and corrections, and some new languages. ICU adds a data filtering/subsetting mechanism, improved formatting API, and a C++ LocaleBuilder.
ICU is a software library widely used by products and other libraries to support the world's languages, implementing both the latest version of the Unicode Standard and of the Unicode locale data (CLDR).
For details please see http://site.icu-project.org/download/64.