fix version number in readme + remove K2 info

Author: flokosiol

.github/README.md

@@ -1,8 +1,6 @@
 # Kirby Focus
 
-![Version](https://img.shields.io/badge/Version-3.0.5-blue.svg) ![License](https://img.shields.io/badge/License-MIT-green.svg) ![Kirby](https://img.shields.io/badge/Kirby-3.x-f0c674.svg)
-
-> **FOR THE KIRBY 2 VERSION OF THIS PLUGIN, PLEASE CHECK OUT THE [KIRBY-2](https://github.com/flokosiol/kirby-focus/tree/kirby-2) BRANCH**
+![Version](https://img.shields.io/badge/Version-3.0.6-blue.svg) ![License](https://img.shields.io/badge/License-MIT-green.svg) ![Kirby](https://img.shields.io/badge/Kirby-3.x-f0c674.svg)
 
 With this plugin for [Kirby CMS](http://getkirby.com) you can prevent the most important part of an image from being cropped when creating automated thumbs.