Bug Fixes
* compact children before counting them ([56a2ece](https://github.com/ipfs-shipyard/js-hamt-sharding/commit/56a2ece))
* remove async generator so we can webpack it ([ebef92a](https://github.com/ipfs-shipyard/js-hamt-sharding/commit/ebef92a))
Features
* use async instead of callbacks ([2478d09](https://github.com/ipfs-shipyard/js-hamt-sharding/commit/2478d09))