servant-multipart-client-0.12.2: CHANGELOG.md

0.12.2
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- Support servant-0.20 [#69](https://github.com/haskell-servant/servant-multipart/pull/69).

0.12.1
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- First release of split package,
  [#51](https://github.com/haskell-servant/servant-multipart/pull/51)