Add DeepNonNullable

[malash]

As I mentioned in the PR #33 I have created a new type DeepNonNullable.

type NestedProps = {
  first?: null | {
    second?: null | {
      name?: null | string;
    };
  };
};
let a = {} as NestedProps;
const s1: string = a.first!.second!.name!;
let b = {} as DeepNonNullable<NestedProps>;
const s2: string = b.first.second.name;

[piotrwitek]

That's cool, looks good!

Would you mind to also add a new entry in the API Docs in readme.md?
Thanks!

[malash]

Thanks. I'v added documentation for it.

[malash]

I fixed a typo here.

[piotrwitek]

Great job! Thanks for contribution. 🎉

[piotrwitek]

Regarding release I plan it for the weekend. I'm working on several other updates with recent [email protected], build tools and better type testing.

[malash]

Thank you!