Move the supported marks to class level for fernet
Move the supported marks to class level for fernet

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