DeprecationWarning Issues

Hi @wheresvic 

your library is very usefull. However recently I got warning

(node:32520) [DEP0106] DeprecationWarning: crypto.createDecipher is deprecated.
(Use `node --trace-deprecation ...` to show where the warning was created)

I believe we need to update crypto.createCipher become `crypto.createCipheriv` vice verca for decrypt as well

Thnaks