Autoloading Deprecation Warning

[sunny]

Describe the bug

Under Rails 6, the gem adds the following deprecation warning:

DEPRECATION WARNING: Initialization autoloaded the constants ActionText::ContentHelper and ActionText::TagHelper.

Being able to do this is deprecated. Autoloading during initialization is going
to be an error condition in future versions of Rails.

Reloading does not reboot the application, and therefore code executed during
initialization does not run again. So, if you reload ActionText::ContentHelper, for example,
the expected changes won't be reflected in that stale Module object.

`config.autoloader` is set to `classic`. These autoloaded constants would have been unloaded if `config.autoloader` had been set to `:zeitwerk`.

Please, check the "Autoloading and Reloading Constants" guide for solutions.
 (called from <top (required)> at /Users/sunny/code/cults/config/environment.rb:7)

To Reproduce

1. Create a Rails 6.0.2.2 app:

   rails new honeypot-captcha-rails-example
   cd honeypot-captcha-rails-example
   rails test

   At this point there is no deprecation warning.

2. Add the gem:

   echo "gem 'honeypot-captcha'" >> Gemfile
   bundle
   spring stop
   rails test

   The "DEPRECATION WARNING" message appears.

[moveson]

@curtis Is there a plan to review the linked PR? Looks like a solid fix.