add PBKDF2HMAC to changelog
add PBKDF2HMAC to changelog

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