Disable Rack::Protection::HostAuthorization

Rack::Protection 4.1.0 has introduced new
`Rack::Protection::HostAuthorization` [[1]]. This makes `www.example.com`
host to be rejected. The easiest solution is to disable this check for
the TestApp.

[1]: sinatra/sinatra#2053

Author: voxik

lib/capybara/spec/test_app.rb

@@ -19,6 +19,7 @@ def initialize(string1, msg)
   set :static, true
   set :raise_errors, true
   set :show_exceptions, false
+  set :host_authorization, { permitted_hosts: [] }
 
   # Also check lib/capybara/spec/views/*.erb for pages not listed here