Fix pry dependency requirement

[esambo]

In order to resolve to a functioning version combination of pry that doesn't raise error NameError: uninitialized constant Pry::Command::ExitAll As a developer having to use Ruby 2.2.0 I want a new pry-byebug 3.6.x version to resolve to pry <0.13

[BigAndini]

I encounter this same error with pry-byebug 3.7.0, pry 0.13.1 and ruby 2.3.3.

[andersonreinkordt]

Also with ruby 2.7.1, pry-byebug 3.7.0, pry 0.13.1

Looks like a resolve for this here: https://github.com/pry/pry/issues/2121#issuecomment-602975164

[deivid-rodriguez]

I think we fixed this in recent versions, let me know if that's not the case!