updated readme

Author: daimor

README.md

@@ -32,19 +32,11 @@ You can run your instance of InterSystems IRIS Community Edition with Docker
 docker run -d --name iris \
  -p 1972:1972 \
  -p 52773:52773 \
+ -e IRIS_USERNAME=_SYSTEM \
+ -e IRIS_PASSWORD=SYS \
  intersystemsdc/iris-community:preview
 ```
 
 _Port 1972 is used for binary communication (this driver, xDBC and so on), and 52773 is for web (Management Portal, IRIS based web-applications and API's)._
 
 The System Management Portal is available by URL: `http://localhost:52773/csp/sys/UtilHome.csp`
-
-The default password - `SYS`, has to be changed after the first login to the management portal. Or start the container with a command that resets the change password flag
-
-```shell
-docker run -d --name iris \
- -p 1972:1972 \
- -p 52773:52773 \
- intersystemsdc/iris-community:preview \
- -a "iris session iris -U%SYS '##class(Security.Users).UnExpireUserPasswords(\"*\")'"
-```