Add link to online docs.

chriskohlhoff · chriskohlhoff · commit ca29b7e3ea32 · 2025-10-29T20:40:46.000+11:00
diff --git a/README b/README
@@ -1,4 +1,5 @@
 asio version 1.36.0
 Released Saturday, 16 August 2025.
 
-See doc/index.html for API documentation and a tutorial.
+Visit https://think-async.com/ or see packaged doc/index.html for API
+documentation and a tutorial.
