chore: Fix README.md

Signed-off-by: Oğuzhan Durgun <oguzhandurgun95@gmail.com>

README.md

@@ -53,7 +53,7 @@ func main() {
         return fmt.Errorf("failed to parse the program: %w", err)
     }
 
-	// Use ast struct to some stuff 
+    // Use ast struct to some stuff 
 }
 ```