Standardized license

[davidbarton]

Hello, can you please use standardized license for project and also add it to package.json

[zurfyx]

@davidbarton and other visitors:

Consider switching to bcrypt. This library hasn't been updated in ~2 years, whilst bcrypt is being updated in a monthly basis.
The source code changes are minimal.

[cmawhorter]

This seems like an option https://github.com/dcodeIO/bcrypt.js

[davidbarton]

Yup already using it, it's great package.