Emit a warning on Python 2.6
Emit a warning on Python 2.6

skeuomorf/cryptography,bwhmather/cryptography,Hasimir/cryptography,kimvais/cryptography,Ayrx/cryptography,Hasimir/cryptography,skeuomorf/cryptography,skeuomorf/cryptography,Hasimir/cryptography,kimvais/cryptography,bwhmather/cryptography,Ayrx/cryptography,Ayrx/cryptography,Ayrx/cryptography,sholsapp/cryptography,bwhmather/cryptography,sholsapp/cryptography,kimvais/cryptography,skeuomorf/cryptography,sholsapp/cryptography,bwhmather/cryptography,Hasimir/cryptography,sholsapp/cryptography,kimvais/cryptography