btw, it's also possible to run a SNAPSHOT version of clj-kondo with docker:

$ docker run -v $PWD/src:/code/src --rm borkdude/clj-kondo:2020.03.21-SNAPSHOT clj-kondo --lint /code/src

/code/src/babashka/impl/clojure/test.clj:303:4: warning: unused binding m