[ruby/irb] Need reline >= 0.1.6
irb 1.3.5 need reline >= 0.1.6 because irb use Reline::IOGate.in_pasting?. This method defined after reline 0.1.6.
Reline::IOGate.in_pasting?
fix #228.
https://github.com/ruby/irb/commit/6b7b8fc324
[ruby/irb] Need reline >= 0.1.6
irb 1.3.5 need reline >= 0.1.6 because irb use
Reline::IOGate.in_pasting?.This method defined after reline 0.1.6.
fix #228.
https://github.com/ruby/irb/commit/6b7b8fc324