Update logo url in readme.

Author: viferga

README.md

@@ -1,6 +1,6 @@
 
 <div align="center">
-  <a href="https://metacall.io" target="_blank"><img src="/deploy/images/logo.png" alt="M E T A C A L L" style="max-width:100%;" width="32" height="32">
+  <a href="https://metacall.io" target="_blank"><img src="https://raw.githubusercontent.com/metacall/core/develop/deploy/images/logo.png" alt="M E T A C A L L" style="max-width:100%;" width="32" height="32">
   <p><b>M E T A C A L L</b></p></a>
   <p>A library for providing inter-language foreign function interface calls</p>
 </div>