update doc

Author: skywind3000

README.md

@@ -458,7 +458,7 @@ As you see, z.lua is the fastest one and requires less resource.
 
 ## History
 
-- 1.7.0 (2019-03-09): Support ranger, fix ReplaceFile issue in luajit (windows).
+- 1.7.0 (2019-03-09): Support [ranger](https://github.com/skywind3000/z.lua/wiki/FAQ#how-to-integrate-zlua-to-ranger-), fix ReplaceFile issue in luajit (windows).
 - 1.6.0 (2019-03-04): optimize with ffi module (luajit builtin module).
 - 1.5.11 (2019-03-02): fixed: os.path.isdir doesn't work for symbol link folders.
 - 1.5.10 (2019-03-01): Prevent writing file racing.