Update README.md

Igor Chepurnoy · web-flow · commit 8eba624465e6 · 2017-08-13T22:30:03.000+03:00
diff --git a/README.md b/README.md
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-Yii2 RBAC
-=========
+<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">Yii2 RBAC Extension</h1>
+    <br>
+</p>
 
 Yii2-rbac provides a web interface for advanced access control and includes following features:
 
