Provide README.md changes

Author: numq

README.md

@@ -18,7 +18,7 @@ and
 <a href="https://github.com/numq/camera-capture">mobile application</a>
 </p>
 
-<div style="text-align:center"><img src="media/preview.png" alt="preview"/></div>
+<div align="center"><img src="media/preview.png" alt="preview"/></div>
 
 ## 📖 Table of Content