Fix link to fluent output class

README.md

@@ -24,9 +24,7 @@ A sample configuration to setup ingestion of data for a tag to Wendelin:
 
   # all parameters of BufferedOutput & Output classes are supported too, e.g.
   # `buffer_type`, `flush_interval`, `num_threads`, `log_level`, etc - see
-  # their code near:
-  #
-  #   https://github.com/fluent/fluentd/blob/master/lib/fluent/output.rb#L182
+  # their code near [here](https://github.com/fluent/fluentd/blob/aa79a4cd16bdab3190dd8fe8f5e2dc92a69c72ea/lib/fluent/compat/output.rb#L219) (2022-03-09).
   #
   # logging setup description:
   #