feature sugestion - write to stdout

[piotr-s-brainhub]

It could work like jsonlint (https://github.com/zaach/jsonlint)
At least two options:

• sort-json -i file.json - overwriting
• sort-json -stdout file.json - writing to stdout (option for backward compatibility)

[kesla]

pull requests accepted :)

[ashley-woodard]

Better yet, don't overwrite files by default.

Many folks would consider that a bug...