Merge pull request PrestaShop#3348 from jeromenadaud/feat-readme

// update readme

README.md

@@ -4,7 +4,7 @@ About PrestaShop
 PrestaShop is a free and open-source e-commerce web application, committed to providing the best shopping cart experience for both merchants and customers. It is written in PHP, is highly customizable, supports all the major payment services, is translated in many languages and localized for many countries, has a fully responsive design (both front and back office), etc. [See all the available features][1].
 
 <p align="center">
-  <img src="http://www.prestashop.com/images/banners/general/ps16-screenshot-github.png" alt="PrestaShop's back office dashboard"/>
+  <img src="http://www.prestashop.com/images/banners/general/ps161-screenshot-github.png" alt="PrestaShop's back office dashboard"/>
 </p>
 
 To download the latest stable public version of PrestaShop, please go to [the download page][2] on the official PrestaShop site.