Expose modules without lib/es6 prefix

[CYBAI]

🚀 Feature request

Current Behavior

As a fp-ts-contrib user, I will need to import modules like fp-ts-contrib/lib/Do or fp-ts-contrib/es6/Do.

Desired Behavior

Ideally, it would be great to just import the module directly without prefix like fp-ts-contrib/Do that fp-ts already shipped in 2.8.0.

Suggested Solution

Maybe we can follow what fp-ts has done in gcanti/fp-ts#1241 to fix this.

Who does this impact? Who is this for?

fp-ts-contrib users

Describe alternatives you've considered

Additional context

Your environment

Software	Version(s)
fp-ts	2.8.0
fp-ts-contrib	0.5.1
TypeScript	3.9.2