Please add hint to remove q2-feature-classifier from testing to enable scikit-learn migrating

[Andreas Tille <andreas@an3as.eu>]

Hi,

we need to check why q2-feature-classifier does not work with
scikit-learn.  But for the moment it would help if scikit-learn could
migrate to testing to free lots of its rdepends from testing removal
warnings.

Thanks a lot
   Andreas.

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