add note about enchant dependency for spellcheck in docs
add note about enchant dependency for spellcheck in docs

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