Add linting to build

[tschady]

Feature Request

Description of Problem:

Linting is manual (or editor based) right now - would help to have automated linter checks inside Travis.

[mdallastella]

Hi.

You can use clj-kondo, which is a little linter written in Clojure and easy to install.

You just need to add a couple of steps in your trevis configuration, one to install clj-kondo and one that runs clj-kondo --lint src. You can also provide a configuration file for enable/disable clj-kondo features if you like.