Allow using the lvh.me URL in development

Rails 6.0 introduced a `hosts` option which, in the development
environment, defaults to all IP addresses and the `localhost` domain.

However, we can't work with subdomains using `localhost`. For that
purpose, the `lvh.me` domain was created [1].

So we're allowing this domain and its subdomains so we can use them
while working with multitenancy in the development environment.

[1] http://railscasts.com/episodes/123-subdomains-revised

config/environments/development.rb

@@ -28,6 +28,10 @@ Rails.application.configure do
     config.cache_store = :null_store
   end
 
+  # Allow accessing the application through a domain so subdomains can be used
+  config.hosts << "lvh.me"
+  config.hosts << /.*\.lvh\.me/
+
   # Don't care if the mailer can't send.
   config.action_mailer.raise_delivery_errors = false
   config.action_mailer.default_url_options = { host: "localhost", port: 3000 }