update z.lua to 1.8.11

Author: skywind3000

z.lua

@@ -4,7 +4,7 @@
 -- z.lua - a cd command that learns, by skywind 2018, 2019, 2020
 -- Licensed under MIT license.
 --
--- Version 1.8.11, Last Modified: 2020/12/31 01:59
+-- Version 1.8.11, Last Modified: 2020/12/31 02:05
 --
 -- * 10x faster than fasd and autojump, 3x faster than z.sh
 -- * available for posix shells: bash, zsh, sh, ash, dash, busybox