update accepted license list

sksat · sksat · commit 093168c26793 · 2024-02-28T21:01:00.000+09:00
diff --git a/about.toml b/about.toml
@@ -4,4 +4,5 @@ accepted = [
     "Unicode-DFS-2016",
     "MPL-2.0",
     "BSD-2-Clause",
+    "BSD-3-Clause",
 ]
