remove enum requirement now that we're not using enum
remove enum requirement now that we're not using enum

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