.shellcheckrc color=always

https://github.com/kvz/bash3boilerplate/blame/c192bba20eb790df9aabc218bffd5a43cf2aa513/.shellcheckrc#L3

`color=always` does nothing 

```bash
$ shellcheck -V
ShellCheck - shell script analysis tool
version: v0.11.0-79-g764802b
license: GNU General Public License, version 3
website: https://www.shellcheck.net
```