patch 8.0.0591: changes to eval functionality not documented

Problem:    Changes to eval functionality not documented.
Solution:   Include all the changes.
diff --git a/src/version.c b/src/version.c
index 3177f77..45f80ee 100644
--- a/src/version.c
+++ b/src/version.c
@@ -765,6 +765,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    591,
+/**/
     590,
 /**/
     589,