update README

Author: igor-chepurnoi

README.md

@@ -1,7 +1,12 @@
-Yii2 Cashier
-===============================================
-
-This extension is the port of [Laravel's Cashier package](https://laravel.com/docs/5.2/billing)
+<p align="center">
+    <a href="https://github.com/yiisoft" target="_blank">
+        <img src="https://avatars0.githubusercontent.com/u/993323" height="100px">
+    </a>
+    <h1 align="center">Cashier Extension for Yii 2</h1>
+    <br>
+</p>
+
+This extension is the port of [Laravel's Cashier package](https://laravel.com/docs/5.4/billing)
 
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