Adds version of Unicode supported

Refs #3104

Author: JJ

doc/Language/unicode.pod6

@@ -4,9 +4,10 @@
 
 =SUBTITLE Unicode support in Raku
 
-Raku has a high level of support of Unicode. This document aims to be both an
-overview as well as description of Unicode features which don't belong
-in the documentation for routines and methods.
+Raku has a high level of support of Unicode, with the latest version supporting
+Unicode 12.1. This document aims to be both an overview as well as description
+of Unicode features which don't belong in the documentation for routines and
+methods.
 
 For an overview on MoarVM's internal representation of strings, see the
 L<MoarVM string documentation|https://github.com/MoarVM/MoarVM/blob/master/docs/strings.asciidoc>.