updated for version 7.4.638
Problem:    Can't build with Lua 5.3 on Windows.
Solution:   use luaL_optinteger() instead of LuaL_optlong(). (Ken Takata)
diff --git a/src/version.c b/src/version.c
index 207ac12..a1f5b66 100644
--- a/src/version.c
+++ b/src/version.c
@@ -742,6 +742,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    638,
+/**/
     637,
 /**/
     636,