Validate against remote file

[mainrs]

Since there are websites that host schemas for all kinds of json files (schemastore.org ), it might be a good idea to support URL validation, e.g.: jsonlint jsonfile.json -V http://json.schemastore.org/babelrc.

[prantlf]

While technically possible, providing the set of developer tools usually present on any machine, not necessary. If you use curl or wget, you can pipe the output to any tool, which does not support HTTP input:

curl -s http://json.schemastore.org/babelrc | jsonlint