Revert "depend on python-cryptography"
Revert "depend on python-cryptography"

This reverts commit 446e130361b8a35e8775ae066ebe87037a9899cf.

See #226

kaeff/pixelated-user-agent,sw00/pixelated-user-agent,torquemad/pixelated-user-agent,SamuelToh/pixelated-user-agent,PuZZleDucK/pixelated-user-agent,pixelated-project/pixelated-user-agent,pixelated/pixelated-user-agent,pixelated/pixelated-user-agent,kaeff/pixelated-user-agent,PuZZleDucK/pixelated-user-agent,phazel/pixelated-user-agent,alabeduarte/pixelated-user-agent,PuZZleDucK/pixelated-user-agent,kaeff/pixelated-user-agent,rdoh/pixelated-user-agent,phazel/pixelated-user-agent,SamuelToh/pixelated-user-agent,phazel/pixelated-user-agent,alabeduarte/pixelated-user-agent,alabeduarte/pixelated-user-agent,torquemad/pixelated-user-agent,SamuelToh/pixelated-user-agent,kaeff/pixelated-user-agent,sw00/pixelated-user-agent,torquemad/pixelated-user-agent,torquemad/pixelated-user-agent,PuZZleDucK/pixelated-user-agent,sw00/pixelated-user-agent,kaeff/pixelated-user-agent,rdoh/pixelated-user-agent,SamuelToh/pixelated-user-agent,pixelated-project/pixelated-user-agent,phazel/pixelated-user-agent,PuZZleDucK/pixelated-user-agent,rdoh/pixelated-user-agent,rdoh/pixelated-user-agent,sw00/pixelated-user-agent,sw00/pixelated-user-agent,alabeduarte/pixelated-user-agent,pixelated/pixelated-user-agent,pixelated-project/pixelated-user-agent,pixelated-project/pixelated-user-agent,pixelated/pixelated-user-agent,torquemad/pixelated-user-agent,phazel/pixelated-user-agent,pixelated/pixelated-user-agent,pixelated-project/pixelated-user-agent,alabeduarte/pixelated-user-agent,rdoh/pixelated-user-agent,SamuelToh/pixelated-user-agent