Clojurians Log v2

the default content-negotiation works with json, edn and transit. If you don't need custom readers, just send application/transit+json and it should work oob

@ikitommi i’d like to follow up on https://github.com/metosin/compojure-api/pull/436 and https://github.com/metosin/compojure-api/pull/439

please let me know if there is anything i can do to move them along