beautify README.md

Author: qwerty541

README.md

@@ -1,8 +1,18 @@
-# OpenCart Plugins
+<h1 align="center">OpenCart Plugins</h1>
 
-[![License: MIT](https://img.shields.io/badge/License-MIT-blue.svg)](./LICENSE)
-[![Github stars](https://img.shields.io/github/stars/overvis/opencart-plugins.svg)](https://github.com/overvis/opencart-plugins/stargazers)
-[![GitHub forks](https://img.shields.io/github/forks/overvis/opencart-plugins.svg)](https://github.com/overvis/opencart-plugins/network/members)
-[![GitHub issues](https://img.shields.io/github/issues/overvis/opencart-plugins.svg)](https://github.com/overvis/opencart-plugins/issues)
+<p align="center">
+  <a href="./LICENSE">
+    <img src="https://img.shields.io/badge/License-MIT-blue.svg" />
+  </a>
+  <a href="https://github.com/overvis/opencart-plugins/stargazers">
+    <img src="https://img.shields.io/github/stars/overvis/opencart-plugins.svg" />
+  </a>
+  <a href="https://github.com/overvis/opencart-plugins/network/members">
+    <img src="https://img.shields.io/github/forks/overvis/opencart-plugins.svg" />
+  </a>
+  <a href="https://github.com/overvis/opencart-plugins/issues">
+    <img src="https://img.shields.io/github/issues/overvis/opencart-plugins.svg" />
+  </a>
+</p>
 
-Please see READMEs in subprojects for details
+<p align="center">Please see READMEs in subprojects for details.</p>