docs: Note release date of 1.9.1

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
diff --git a/docs/Releases.md b/docs/Releases.md
index c24d3c0..b9a9a17 100644
--- a/docs/Releases.md
+++ b/docs/Releases.md
@@ -20,6 +20,11 @@
       instruction is now emulated)
 * Several bug fixes and code cleanups
 
+SeaBIOS 1.9.1
+-------------
+
+Available on 20160215. Stable release containing only bug fixes.
+
 SeaBIOS 1.8.0
 =============