Update man page to latest PNG 3e draft
diff --git a/png.5 b/png.5
index 16c1032..31075de 100644
--- a/png.5
+++ b/png.5
@@ -20,10 +20,10 @@
.SH "SEE ALSO"
.BR "libpng"(3), " zlib"(3), " deflate"(5), " " and " zlib"(5)
.LP
-PNG Specification (Third Edition) Candidate Recommendation Draft, July 2024:
+PNG Specification (Third Edition) Candidate Recommendation Draft, January 2025:
.IP
.br
-https://www.w3.org/TR/2024/CRD-png-3-20240718/
+https://www.w3.org/TR/2025/CRD-png-3-20250121/
.LP
PNG Specification (Second Edition), November 2003:
.IP
