Classes that are not scoped (part of the public API) have `@internal` annotation added to them since 0.18.5

[sebastianbergmann]

Since #882, classes that are not scoped (because they should be part of the public API exposed by the PHAR) have an @internal annotation added to them.

See sebastianbergmann/phpunit#5596 for details.

[sebastianbergmann]

@theofidry wrote in sebastianbergmann/phpunit#5596 (comment):

If it's a big deal I would just revert the whole thing, I am not sure yet it is working as intended.

I'm not sure if you should revert this or not. I just need to be able to disable this behaviour, I guess.