Update release notes

Author: Jérémie Bertrand

ReleaseNotes.md

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+ - [#319](https://github.com/Code52/pretzel/pull/319) - Site with support of html_pages contributed by Roland Bär ([rolandbaer](https://github.com/rolandbaer))
+ - [#318](https://github.com/Code52/pretzel/issues/318) - Chocolatey install - Get-BinRoot deprecated
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+Commits: b7afc2ced8...8b677201a1
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 # 0.6.0 (2017-01-29)
 
  - [#317](https://github.com/Code52/pretzel/pull/317) - Support for :slug in permalinks contributed by Thomas Freudenberg ([thoemmi](https://github.com/thoemmi)) +Enhancement