DOC update release dates in news
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<li><strong>Scikit-learn from 0.21 requires Python 3.5 or greater.</strong>
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- <li><em>May 2019.</em> scikit-learn 0.21 is available for download (<a href="whats_new.html#version-0-21">Changelog</a>).
+ <li><em>May 2019.</em> scikit-learn 0.21.0 and 0.21.1 are available for download (<a href="whats_new.html#version-0-21">Changelog</a>).
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<li><em>March 2019.</em> scikit-learn 0.20.3 is available for download (<a href="whats_new.html#version-0-20-3">Changelog</a>).
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