Fix header::reason

CHANGELOG.md

@@ -3,6 +3,8 @@ Version 45
 * Workaround for boost::asio::basic_streambuf type check
 * Fix message doc image
 * Better test::enable_yield_to
+* Add test::pipe
+* Fix header::reason
 
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include/beast/http/message.hpp

@@ -246,7 +246,7 @@ struct header<false, Fields>
     */
     auto
     reason() const ->
-        decltype(std::declval<Fields>().method()) const
+        decltype(std::declval<Fields>().reason()) const
     {
         return fields.reason();
     }