Add dependency to README. Closes #7.
Add dependency to README. Closes #7.

rlewis1988/logic_and_proof,rlewis1988/logic_and_proof,leanprover/logic_and_proof,rlewis1988/logic_and_proof,avigad/logic_and_proof,leanprover/logic_and_proof,avigad/logic_and_proof,avigad/logic_and_proof,leanprover/logic_and_proof