updated for version 7.3.514

Problem:    No completion for :history command.
Solution:   Add the completion and update the docs. Also fix ":behave"
            completion. (Dominique Pelle)

src/vim.h

@@ -781,6 +781,7 @@ extern char *(*dyn_libintl_textdomain)(const char *domainname);
 #define EXPAND_FILES_IN_PATH	38
 #define EXPAND_OWNSYNTAX	39
 #define EXPAND_LOCALES		40
+#define EXPAND_HISTORY		41
 
 /* Values for exmode_active (0 is no exmode) */
 #define EXMODE_NORMAL		1