Update trick2013/yhara for Ruby 2.4

I need to raise LocalJumpError here (for the first "J" of the
output "JUST ANOTHER RUBY HACKER"), but this `return` does
not raise error in Ruby 2.4.

[Fix GH-1703]
Author:    Yutaka HARA <yutaka.hara+github@gmail.com>

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@59989 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

sample/trick2013/yhara/entry.rb

@@ -2,7 +2,7 @@ def _(&b)$><<->(x){x ? (String===x ?x.upcase:
 (Class===x ? x : x.class).name[$a?0:($a=5)]):
 " "}[ begin b[];rescue Exception;$!;end ] end
 
-_ {                 return                  }
+_ {                  yield                  }
 _ {            method(:p).unbind            }
 _ {                eval "{ "                }
 _ {           Thread.current.join           }