Both mypy and pytype only use the major and minor version in type checking. Using
checks like "sys.version_info >= (3, 4, 4)" won't actually work properly for
people type checking their code using version 3.4, because (3, 4) >= (3, 4, 4) will
always be false (at least in mypy's approach; not sure if pytype is different).
* Revert "Revert "add types to ssl for py2 (#251)""
This reverts commit 0b19fb471c (thus re-adding types to ssl).
* add some undocumented ssl constants