Improve Error Handling #58

I'll add the reproducible code later but let's say a user's not running DEBUG=kayn:* for npm/debug, if there is a certain error in the code (I believe it was Rejected Promise), they might get something like this:

rejectedblahblahblah: #Object

which is obviously useless information and should be improved...

if I remember my error is a simple object with no stacktraces too so let's fix that!

If you're interested in helping, leave a note here or on discord (and then I"ll leave a note here for you)

Most important thing is backwards compatibility.