v0.7.6

• workaround CVE-2020-26263 - Bleichenbacher oracle in RSA decryption. Please note that while the code was fortified, because of peculiarities of python, it's not possible to fully fix it. If you require resistance against side-channel attacks please use a different library.
• stop mis-detecting pycryptodome as pycrypto
• start running test coverage on Python 3.8, fix test suite incompatibility with python 3.8
• fix incompatibility of imaplib wrapper with imaplib on python 3.9
• start running test coverage on Python 3.9
• drop official support for Python 3.2: while we didn't perform any changes that should make the library stop working on Python 3.2, our dependency, python-ecdsa, doesn't support it