Currently running gron on large json files is very slow. For example a 40MB file takes over a minute:

> time gron big.json > foo

real    1m28.850s
user    1m37.038s
sys 0m2.333s

My guess is it's in the sorting phase. Would it possible to avoid sorting all together? Maybe doing a streaming decode of the json would be helpful too.

At the very least it should be possible to disable sorting via command line option.