Keys from config files should be converted to symbols

[vStone]

When using the configuration file like the examples you end up with a string and symbol key.

#!/usr/bin/env ruby
require 'cl'

module Example
  class Foo < ::Cl::Cmd
    opt '--foobar STRING', default: 'Foobar default value'
    def run
      puts opts.to_yaml()
    end
  end
end

File.open('.example.yml', 'w') do |file|
  file.puts <<~yml
  ---
  foo:
    foobar: 'Foobar from Yaml'
  yml
end

puts "Default options used"
Cl.new('example').run(['foo'])
puts "--------------------"
puts "Command line used"
Cl.new('example').run(['foo', '--foobar', 'From command line'])
puts "--------------------"

outputs

Default options used
---
foobar: Foobar from Yaml
:foobar: Foobar default value
--------------------
Command line used
---
foobar: Foobar from Yaml
:foobar: From command line
--------------------