New version of HighLine does not include default Float responses in ask prompts

[jordanbyron]

https://github.com/JEG2/highline/blob/master/lib/highline/question.rb#L254

prompt.ask("Time to enter (CTRL-C to cancel): ", String) {|q| q.default = "1" }
#=> Time to enter (CTRL-C to cancel): |1| 
#=> "1"
prompt.ask("Time to enter (CTRL-C to cancel): ", Float) {|q| q.default = 1.0 }
#=> Time to enter (CTRL-C to cancel): 
#=> 1.0

If we stick with the older version we can just add gem 'highline', '1.6.21' to the top of application.rb and not have to worry about the change ...