ruby-debug19 added to Gemfile [#4290 state:committed]

Signed-off-by: Nwycats <wycats@gmail.com>

Gemfile

@@ -11,6 +11,8 @@ group :mri do
   if RUBY_VERSION < '1.9'
     gem "system_timer"
     gem "ruby-debug", ">= 0.10.3"
+  else
+    gem "ruby-debug19"
   end
 end