releaser: Add release notes to /docs for release of 0.27.1

[ci skip]

Author: bep

docs/content/news/0.27.1-relnotes-ready.md

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+---
+date: 2017-09-13
+title: "0.27.1"
+description: "0.27.1"
+categories: ["Releases"]
+---
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+This fixes a regression introduced in [Go 1.9](https://github.com/golang/go/issues/21844) which lead to HTML in shortcodes in multi output Hugo sites being wrongly escaped in some cases.
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+* Fix escaped HTML Go 1.9 multioutput issue (#3880) [2d613dd9](https://github.com/gohugoio/hugo/commit/2d613dd905bb8eeb8af57e30ddd749a0f04fbd3c) [@bep](https://github.com/bep) [#3876](https://github.com/gohugoio/hugo/issues/3876)
+
+* Bump to Go 1.9 in the Snap build [642ba6ca](https://github.com/gohugoio/hugo/commit/642ba6cab24c558b16378178fe829cbc45845424) [@bep](https://github.com/bep) 
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