Fix Readme

Author: evshvarov

README.md

@@ -4,7 +4,8 @@ Export/Import sources in UDL format for [ISC Caché 2016.2](http://www.intersyst
 # Installation
 Download code and run
 ```
-do $System.OBJ.ImportDir("/dir/cache-udl","*.xml;*.cls;*.mac;*.int;*.inc;*.dfi","ck",,1)
+set dir="/dir/cache-udl
+do $System.OBJ.ImportDir(dir,"*.xml;*.cls;*.mac;*.int;*.inc;*.dfi","ck",,1)
 ```
 or
 import the [release](https://github.com/intersystems-ru/cache-udl/releases) to the namespace.