Remove badge images from README

Removed shield badges for version, downloads, and license from README.

Author: alexantr

README.md

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 This extension renders a [TinyMCE](https://www.tiny.cloud/tinymce/) widget for [Yii framework 2.0](http://www.yiiframework.com).
 
-[![Latest Stable Version](https://img.shields.io/packagist/v/alexantr/yii2-tinymce.svg)](https://packagist.org/packages/alexantr/yii2-tinymce)
-[![Total Downloads](https://img.shields.io/packagist/dt/alexantr/yii2-tinymce.svg)](https://packagist.org/packages/alexantr/yii2-tinymce)
-[![License](https://img.shields.io/github/license/alexantr/yii2-tinymce.svg)](https://raw.githubusercontent.com/alexantr/yii2-tinymce/master/LICENSE)
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 ## Installation
 
 Install extension through [composer](http://getcomposer.org/):