[intro.ack] Add Unicode to the list of registered trademarks we mention.

zygoloid · zygoloid · commit 9ce9b23148af · 2020-03-02T16:55:45.000-08:00
diff --git a/source/intro.tex b/source/intro.tex
@@ -682,5 +682,8 @@
 \pnum
 ECMAScript\textregistered\ is a registered trademark of Ecma International.
 
+\pnum
+Unicode\textregistered\ is a registered trademark of Unicode, Inc.
+
 \pnum
 All rights in these originals are reserved.
