add os random engine to changelog
add os random engine to changelog

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