Update README.md

Author: lvorex

README.md

@@ -36,7 +36,7 @@
   <img width="12" />
   <img src="https://cdn.jsdelivr.net/gh/devicons/devicon/icons/php/php-plain.svg" height="30" alt="php logo"  />
   <img width="12" />
-  <img src="https://cdn.jsdelivr.net/gh/devicons/devicon/icons/csharp/csharp-original.svg" height="30" alt="csharp logo">
+  <img src="https://cdn.jsdelivr.net/gh/devicons/devicon/icons/csharp/csharp-plain.svg" height="30" alt="csharp logo">
 </div>
 
 ###