patch 8.1.0731: JS encoding does not handle negative infinity

Problem:    JS encoding does not handle negative infinity.
Solution:   Add support for negative infinity for JS encoding. (Dominique
            Pelle, closes #3792)
diff --git a/src/version.c b/src/version.c
index 7aeaa48..d7c610b 100644
--- a/src/version.c
+++ b/src/version.c
@@ -796,6 +796,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    731,
+/**/
     730,
 /**/
     729,