patch 8.1.0157: old iTerm2 is not recognized, resulting in stray output

Problem:    Old iTerm2 is not recognized, resulting in stray output.
Solution:   Recognize the termresponse.
diff --git a/src/version.c b/src/version.c
index 63a7694..8d9a339 100644
--- a/src/version.c
+++ b/src/version.c
@@ -790,6 +790,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    157,
+/**/
     156,
 /**/
     155,