3.0.0

As with 2.0.0 this release has no javascript api changes. This version bump is the result of this pull request: #12

In this pull request the flow types for memoize-one where improved to be more correct. In doing so the flow type became a little tighter and more correct. There may be a situation where some code could potentially be relying on the less stringent type checking and in which case this change would break their code. As this is a change in public api that may possibility by some remote chance break a consumer - I thought it safest to do a major version bump.