types for ts

[johannbuscail]

This pull request adds typing to secure-env as requested in #23
I added a small test, resolved some errors and updated the documentation.
I changed some property names to make it more clear and easy to maintain.

To add types, it's easy, just use generics:

import SecureEnv, { IObject } from "secure-env"

interface IEnv extends IObject{
  DB_HOST: string;
  DB_USER: string;
  DB_PASS: string;
}

const env = SecureEnv<IEnv>(your_options);

If there's anything I can improve, just tell me :)
That's all, I hope it will be merged quickly !

[kunalpanchal]

Thank you for the PR @johannb75. Looks neat. I will review the PR at the earliest.

[johannbuscail]

Hello @kunalpanchal, do you know when this will be merged and published ?

[johannbuscail]

@kunalpanchal could you merge it and publish it to npm ??

[johannbuscail]

@kunalpanchal any update ?
The work is already done. You only have to merge it and publish it.

[vishnu-blkbox]

@kunalpanchal can you merge this if this is ok?