chore: release version v42.0.0-pre.0

Author: Alan Shaw

CHANGELOG.md

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+# [42.0.0-pre.0](https://github.com/ipfs/js-ipfs-http-client/compare/v41.0.1...v42.0.0-pre.0) (2020-01-23)
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+
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 <a name="41.0.1"></a>
 ## [41.0.1](https://github.com/ipfs/js-ipfs-http-client/compare/v41.0.0...v41.0.1) (2020-01-23)