pty/shl.rb: update [ci skip]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@57531 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
pty/shl.rb: update [ci skip]
PTY::ChildExited no longer raises asynchronously since r20298.
[ruby-dev:49974] [Bug #13191]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@57531 b2dd03c8-39d4-4d8f-98ff-823fe69b080e