[ruby/drb] Removed old version on doc section

https://github.com/ruby/drb/commit/104f1a4db3
2023-11-06 18:40:08 +09:00 · 2023-11-06 18:40:08 +09:00 · 84b2a6ad5d
--- a/lib/drb/drb.rb
+++ b/lib/drb/drb.rb
@ -2,7 +2,7 @@
 #
 # = drb/drb.rb
 #
-# Distributed Ruby: _dRuby_ version 2.0.4
+# Distributed Ruby: _dRuby_
 #
 # Copyright (c) 1999-2003 Masatoshi SEKI.  You can redistribute it and/or
 # modify it under the same terms as Ruby.