Update README.md

Author: zoltanszogyenyi

README.md

@@ -1,5 +1,5 @@
-<a href="https://themesberg.com/black-friday?utm_medium=social&utm_source=github&utm_campaign=bf-readme-2020">
-<img border="0" alt="Themesberg Black Friday Offer 2020" src="https://themesberg.s3.us-east-2.amazonaws.com/public/posts/black-friday/2020/black-friday-bootstrap-themes.png" >
+<a href="https://themesberg.com/cyber-monday?utm_medium=social&utm_source=github&utm_campaign=cm-readme-2020">
+<img border="0" alt="Themesberg Cyber Monday Offer 2020" src="https://themesberg.s3.us-east-2.amazonaws.com/public/campaigns/cyber-monday/2020/thumbnail.png" >
 </a>
 
 # [Pixel Bootstrap 4 UI Kit](https://demo.themesberg.com/pixel-lite/) [![Tweet](https://img.shields.io/twitter/url/http/shields.io.svg?style=social&logo=twitter)](https://twitter.com/intent/tweet?url=https%3A%2F%2Fgithub.com%2Fthemesberg%2Fpixel-bootstrap-ui-kit&via=themesberg&text=Kick-start%20development%20with%20Pixel%20Bootstrap%20UI%20Kit&hashtags=bootstrap%2C%20ui%20kit)