Add release note about RISC-V 64 support

HeliC829 · HeliC829 · commit f592ac69e2fe · 2025-08-20T16:30:33.000+08:00
Signed-off-by: Julian Zhu &lt;julian.oerv@isrc.iscas.ac.cn&gt;
diff --git a/Release_notes.txt b/Release_notes.txt
@@ -83,6 +83,8 @@ v2.26
 
 * Added SM3-NI AVX2 implementation.
 
+* Added support for RISC-V 64 architecture.
+
 v2.25
 
 * Added new API including parameter checking (starting with isal_ prefix).
