Update README.md

README.md

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 # Migrator
-[![Maintainability](https://api.codeclimate.com/v1/badges/4cd409c1b35085e147af/maintainability)](https://codeclimate.com/github/microredis/migrator/maintainability) [![Build Status](https://travis-ci.org/microredis/migrator.svg?branch=master)](https://travis-ci.org/microredis/migrator)
 
 Script for realtime migration from one redis source to another.
 Just specify ```$REDIS_SOURCE``` and ```$REDIS_DESTINATION``` and the deal will be done.
-
-To use this tool
-Use docker:
-
-```shell
-#!/bin/bash
-
-docker run -it --rm \
--e REDIS_SOURCE=redis://localhost:6379 \
--e REDIS_DESTINATION=redis://localhost:6380 \
-microredis/migrator
-```