releaser: Add release notes to /docs for release of 0.31.1

[ci skip]

Author: bep

docs/content/news/0.31.1-relnotes-ready.md

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+---
+date: 2017-11-27
+title: "0.31.1"
+description: "0.31.1"
+slug: "0.31.1"
+categories: ["Releases"]
+images:
+- images/blog/hugo-bug-poster.png
+
+---
+
+	
+
+This is a bug-fix release with one important bug fix:
+
+* Fix broken `--appendPort=false` [8afd7d9c](https://github.com/gohugoio/hugo/commit/8afd7d9ceb0d168300e3399c6e87a355a88c9a28) [@bep](https://github.com/bep) [#4111](https://github.com/gohugoio/hugo/issues/4111)
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