3.4.7:
New features
* API documentation is made with sphinx instead of epydoc.
* Start using ``importlib`` instead of ``imp``` where available.
Resolved issues
* Fixed PEM header for RSA/DSA public keys.
The library can also be compiled using MinGW.
Removed use of alloca().
[Security] Removed implementation of deprecated "quick check" feature of PGP block cipher mode.
Improved the performance of scrypt by converting some Python to C.