Clojurians Log v2

there was a bug in joker.os/exec that is now fixed: https://github.com/candid82/joker/commit/f0e093341cf5c916ffb99e51bcc1227dc3e655a3

this now works:

> echo hi | ./joker -e '(pprint (joker.os/exec "cat" {:stdin :pipe}))'
{:success true,
 :exit 0,
 :out "hi\n",
 :err ""}