patch 7.4.1560
Problem:    Dict options with a dash are more difficult to use.
Solution:   Use an underscore, so that dict.err_io can be used.
diff --git a/src/version.c b/src/version.c
index eb42b32..52e2b80 100644
--- a/src/version.c
+++ b/src/version.c
@@ -744,6 +744,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1560,
+/**/
     1559,
 /**/
     1558,