releaser: Add relase notes to /docs for release of 0.20.3

[ci skip]

docs/content/release-notes/0.20.3-relnotes.md

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+
+---
+date: 2017-04-24
+title: 0.20.3
+---
+
+
+
+This is a bug-fix relase with one important fix. But it also adds some harness around [GoReleaser](https://github.com/goreleaser/goreleaser) to automate the Hugo release process. Big thanks to [@caarlos0](https://github.com/caarlos0) for great and super-fast support fixing issues along the way.
+
+Hugo now has:
+
+* 16619+ [stars](https://github.com/spf13/hugo/stargazers)
+* 458+ [contributors](https://github.com/spf13/hugo/graphs/contributors)
+* 156+ [themes](http://themes.gohugo.io/)
+
+## Enhancement
+
+* Automate the Hugo release process [550eba64](https://github.com/spf13/hugo/commit/550eba64705725eb54fdb1042e0fb4dbf6f29fd0) [@bep](https://github.com/bep) [#3358](https://github.com/spf13/hugo/issues/3358) 
+
+## Fix
+
+* Fix handling of zero-length files [9bf5c381](https://github.com/spf13/hugo/commit/9bf5c381b6b3e69d4d8dbfd7a40074ac44792bbf) [@bep](https://github.com/bep) [#3355](https://github.com/spf13/hugo/issues/3355)