release: Add relase notes to /docs for release of 0.20.6

[ci skip]

Author: bep

docs/content/release-notes/0.20.6-relnotes.md

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+---
+date: 2017-04-27
+title: 0.20.6
+---
+
+	
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+There have been some [shouting on discuss.gohugo.io](https://discuss.gohugo.io/t/index-md-is-generated-in-subfolder-index-index-html-hugo-0-20/6338/15) about some broken sites after the release of Hugo `0.20`. This release reintroduces the old behaviour, making  `/my-blog-post/index.md` work as expected.
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+Hugo now has:
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+* 16675+ [stars](https://github.com/spf13/hugo/stargazers)
+* 456+ [contributors](https://github.com/spf13/hugo/graphs/contributors)
+* 156+ [themes](http://themes.gohugo.io/)
+
+## Fixes
+
+* Avoid index.md in /index/index.html [#3396](https://github.com/spf13/hugo/issues/3396) 
+* Make missing GitInfo a WARNING [b30ca4be](https://github.com/spf13/hugo/commit/b30ca4bec811dbc17e9fd05925544db2b75e0e49) [@bep](https://github.com/bep) [#3376](https://github.com/spf13/hugo/issues/3376) 
+* Fix some of the fpm fields for deb [3bd1d057](https://github.com/spf13/hugo/commit/3bd1d0571d5f2f6bf0dc8f90a8adf2dbfcb2fdfd) [@anthonyfok](https://github.com/anthonyfok) 
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