patch 9.1.0597: KeyInputPre cannot get the (unmapped typed) key

Problem:  KeyInputPre cannot get the (unmapped typed) key
          (after v9.1.0563)
Solution: Add the "typedchar" property to the v:event dict
          (Shougo Matsushita)

closes: #15231

Co-authored-by: zeertzjq <zeertzjq@outlook.com>
Signed-off-by: Shougo Matsushita <Shougo.Matsu@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/version.c b/src/version.c
index e989d6e..e22fe61 100644
--- a/src/version.c
+++ b/src/version.c
@@ -705,6 +705,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    597,
+/**/
     596,
 /**/
     595,