Fix rules according to the current release process #12047
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I read rules and think that I can extend non-internal classes and not test classes.
Only security fixes can cause BC.
But this PR symfony/symfony#20487 is not Security fix and break my code.
I extended
ProgressBar
and didn't see any troubles. All works fine. After upgrade from 3.2 to 3.3 I got BC.To avoid future troubles it is better to not extend classes. Developers should know that not only security fixes can break the code.