add badges to readme

README.md

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 # Modbus TCP and RTU over TCP protocol client
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+[![Latest Version](https://img.shields.io/packagist/v/aldas/modbus-tcp-client.svg)](https://packagist.org/packages/aldas/modbus-tcp-client)
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 * Modbus TCP/IP specification: http://www.modbus.org/specs.php
 * Modbus TCP/IP and RTU simpler description: http://www.simplymodbus.ca/TCP.htm
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 ## Installation
 
 Use [Composer](https://getcomposer.org/) to install this library as dependency.