History
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+1.5.1 (2018-08-05)
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+
+* Added formal support for Python 3.7
+* Removed formal support for Python 3.3
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+1.4.3 (2018-06-14)
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+* Catch SyntaxError from asyncio import on older versions of Python, thanks to @asottile
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1.4.2 (2018-04-08)
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