Fix typo

Author: ahugeat

index.html

@@ -32,7 +32,7 @@ <h1>Gamedev Framework (gf)</h1>
 
         <h2>Releases</h2>
 
-        <h3>gf 0.19.0 (14 Apr 2021)</h3>
+        <h3>gf 0.20.0 (14 Apr 2021)</h3>
 
         <ul>
           <li><a href="v0.20.0">Documentation for gf 0.20.0</a></li>