chore: release version v0.42.0

Author: achingbrain

CHANGELOG.md

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+# [0.42.0](https://github.com/ipfs/js-ipfs-unixfs-importer/compare/v0.41.0...v0.42.0) (2019-11-27)
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+### Performance Improvements
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+* avoid unnecessary buffer copy ([#40](https://github.com/ipfs/js-ipfs-unixfs-importer/issues/40)) ([b5e5b5a](https://github.com/ipfs/js-ipfs-unixfs-importer/commit/b5e5b5a15f8460c0effbedfd6aa39a1e594733df))
+* concurrent file import ([#41](https://github.com/ipfs/js-ipfs-unixfs-importer/issues/41)) ([68ac8cc](https://github.com/ipfs/js-ipfs-unixfs-importer/commit/68ac8cc233dbe73fcb8244911e09ed59789cddc9)), closes [#38](https://github.com/ipfs/js-ipfs-unixfs-importer/issues/38)
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 <a name="0.41.0"></a>
 # [0.41.0](https://github.com/ipfs/js-ipfs-unixfs-importer/compare/v0.40.0...v0.41.0) (2019-11-22)