Update Backers.

Author: trekhleb

BACKERS.md

@@ -2,14 +2,6 @@
 
 > You may support this project via ❤️️ [GitHub](https://github.com/sponsors/trekhleb) or ❤️️ [Patreon](https://www.patreon.com/trekhleb).  
 
-## `O(2ⁿ)` Backers
-
-⏳
-
-## `O(n²)` Backers
-
-⏳
-
 ## `O(n×log(n))` Backers
 
 <ul>
@@ -19,8 +11,7 @@
         src="https://avatars1.githubusercontent.com/u/3613558?s=60&amp;v=4"
         width="30"
         height="30"
-      />
-    </a>
+      /></a>
     &thinsp;
     <a href="https://github.com/bullwinkle">bullwinkle</a>
   </li>