Configure Travis CI to deploy the `development` branch to `master`

[JensRantil]

See https://gohugo.io/tutorials/github-pages-blog/ and (the more important) https://www.sheki.in/post/autodeploy-hugo/.

[JensRantil]

Probably should have this answered first: https://github.com/sheki/parse-blog/issues/1 :)