Update README.md

Author: bwsky-a

README.md

@@ -15,8 +15,8 @@
 
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- <a href="https://mdbootstrap.com/bf/waiting-list/" alt="BF Waiting List" rel="dofollow">
-          		<img src="https://mdbootstrap.com/img/Marketing/campaigns/bf2021/waiting-listBF.gif">
+ <a href="https://mdbootstrap.com/bf/sale/" alt="BF Waiting List" rel="dofollow">
+          		<img src="https://mdbcdn.b-cdn.net/img/Marketing/campaigns/bf2021/black-friday-sale.gif">
           </a>
           
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