fix bug that was setting arrays as keys in default_options hash

[wyattisimo]

Lines 26-28 in lib/rack/ssl-enforcer.rb are causing the default_options hash to look like this:

{
  :redirect_to => nil,
  :redirect_code => nil,
  :strict => false,
  :mixed => false,
  :hsts => nil,
  :http_port => nil,
  :https_port => nil,
  :force_secure_cookies => true,
  [:only_hosts, :except_hosts] => nil,
  [:only, :except] => nil,
  [:only_methods, :except_methods] => nil
}

This fixes it to look like this:

{
  :redirect_to => nil,
  :redirect_code => nil,
  :strict => false,
  :mixed => false,
  :hsts => nil,
  :http_port => nil,
  :https_port => nil,
  :force_secure_cookies => true,
  :only_hosts => nil,
  :except_hosts => nil,
  :only => nil,
  :except => nil,
  :only_methods => nil,
  :except_methods => nil
}

[rymai]

RIght, thank you!