Virtual Future Applicative Engine (#31)

* Remove all `clojure.core` private function invocations

* Add eval-key-channel for virtual future engine

* applicative engine for virtual futures

* conditionally require ns

* fun with namespaces

* linter

* delete the test

* changelog

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Co-authored-by: Alex Redington <alex.redington@alex.redington>
Co-authored-by: Sophia Velten de Melo <sophia.velten@nubank.com.br>

Update README.md

Merge pull request #22 from nubank/closure-sequences

Closure sequences

Merge pull request #18 from nubank/sync-engine-return-on-channel

Allow running the sync engine with a return on a channel

Merge pull request #17 from nubank/dont-run-leafs-twice

We have a tool to run a body only once, use it

Merge pull request #15 from nubank/contextual-returns

Add contextual returns eval on applicative engine

Update project.clj

clojars url (#7)