Use unknown instead of any as the value to fallback to when the type is not known

[kylemilloy]

Resolves #29

unknown was introduced in TypeScript v3. You can read more on the PR here

Lots to read but the main part is that any is too permissive and should be avoided or you can get some fun stuff like:

const anyVar: any = 'foo'
myVar.method() // does not trigger the linter, it should.

const unknownVar: unknown = 'bar'
unknownVar.method() // triggers the linter

[kylemilloy]

@adenh93 hey just wondering if you've had a chance to take a look at this yet,

[adenh93]

Very sorry, @kylemilloy, I'd been without internet for a month 💀

I'll put out a release today with this change!

[kylemilloy]

Hey hey no sweat. Thank you very much.