Update readme.md

Author: macbre

readme.md

@@ -61,7 +61,7 @@ server {
     ssl_early_data on;
 
     # Add Alt-Svc header to negotiate HTTP/3.
-    add_header alt-svc 'h3=":443"; ma=86400';
+    add_header alt-svc 'h3-27=":443"; ma=86400, h3-28=":443"; ma=86400, h3-29=":443"; ma=86400';
 
     location / {
         # your config