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.

irb.gemspec

@@ -36,5 +36,5 @@ Gem::Specification.new do |spec|
 
   spec.required_ruby_version = Gem::Requirement.new(">= 2.5")
 
-  spec.add_dependency "reline", ">= 0.1.5"
+  spec.add_dependency "reline", ">= 0.1.6"
 end