Update CHANGELOG.md

Author: Kapeli

CHANGELOG.md

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+# 1.8.5
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+* Add Apple API Reference docset support for Xcode 9.3 - [c585578](https://github.com/Kapeli/Dash-iOS/commit/c585578d0ab965dd3481f4c06aff6c320873d5f3)
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 # 1.8.4
 
 * Fixed an issue which caused the Apple API Reference docset to not be able to display some pages. Thanks to [@philosopherdog](https://github.com/philosopherdog) for reporting the issue - [#71](https://github.com/Kapeli/Dash-iOS/issues/71)