ICU-22677 chore: update README.md / LICENSE (#40)

- https://github.com/unicode-org/.github/issues/15
diff --git a/LICENSE b/LICENSE
index 7cdb11a..7a7aef7 100644
--- a/LICENSE
+++ b/LICENSE
@@ -2,7 +2,7 @@
 
 COPYRIGHT AND PERMISSION NOTICE
 
-Copyright © 2016-2023 Unicode, Inc.
+Copyright © 2016-2024 Unicode, Inc.
 
 NOTICE TO USER: Carefully read the following legal agreement. BY
 DOWNLOADING, INSTALLING, COPYING OR OTHERWISE USING DATA FILES, AND/OR
@@ -38,6 +38,8 @@
 dealings in these Data Files or Software without prior written
 authorization of the copyright holder.
 
+SPDX-License-Identifier: Unicode-3.0
+
 ---------------------
 
 Third-Party Software Licenses
diff --git a/README.md b/README.md
index 4080860..d6e97a8 100644
--- a/README.md
+++ b/README.md
@@ -17,7 +17,7 @@
 
 ### Copyright & Licenses
 
-Copyright © 2016-2023 Unicode, Inc. Unicode and the Unicode Logo are registered trademarks of Unicode, Inc. in the United States and other countries.
+Copyright © 2016-2024 Unicode, Inc. Unicode and the Unicode Logo are registered trademarks of Unicode, Inc. in the United States and other countries.
 
 The project is released under [LICENSE](./LICENSE).