Merge pull request #706 from sanfrecce-osaka/fix-broken-link-that-doc…

…ument-of-readline-stdlib

Fix broken link that document of readline stdlib

README.md

@@ -15,7 +15,7 @@ Reline is compatible with the API of Ruby's stdlib 'readline', GNU Readline and
 
 It's compatible with the readline standard library.
 
-See [the document of readline stdlib](https://ruby-doc.org/stdlib/libdoc/readline/rdoc/Readline.html) or [bin/example](https://github.com/ruby/reline/blob/master/bin/example).
+See [the document of readline stdlib](https://ruby-doc.org/stdlib/exts/readline/Readline.html) or [bin/example](https://github.com/ruby/reline/blob/master/bin/example).
 
 ### Multi-line editing mode