This release is dedicated to Factorio. If this is how much fun it is to
build factories and oppress natives, then history makes a lot of sense.

Disable smart typography extension for markdown input

Fixes #1392

Add OpenBSD to "Installing" section of README.md

Add OpenBSD to "Installing" section.

Fix typo in CHANGELOG

Update Docker build-only image to Ubuntu 18.04

Ref:
> Ubuntu 17.10 (Artful Aardvark) End of Life reached on July 19 2018
https://fridge.ubuntu.com/2018/07/19/ubuntu-17-10-artful-aardvark-end-of-life-reached-on-july-19-2018/

Fix build with ghc 8.6.1

Pattern matching in "do" requires a MonadFail context, which we don't have in
pure code. Instead, we'll use "case-of" to bind the part of the state that
we're interested in.

Understand array variable declaration in read (fixes #679)

Add link to flymake-shellcheck under Emacs section

Expand "rhs"; this abbreviation seems needlessly obfuscating.

It used to only treat all trailing variables in read as varaible
declarings, but an array variable can be declared in other positions:

    read -a foo -r

foo is a declared variable, and multiple such variables can be declared.

I've recently created the flymake-shellcheck package for Emacs, which allows using ShellCheck with the built-in Flymake package.