A way to modify log level

[silverwind]

I'd like to silence non-error messages in the console, e.g only have output from the actual shellcheck binary, e.g a ERROR log level. It looks like the INFO log level is hardcoded here.

Would you mind supporting a environment variable like SHELLCHECK_LOG_LEVEL so that users can control this log level? I can raise a pull request if you agree.

[carlocorradini]

See #133

Can you try it? Thanks

1. Set environment variable SHELLCHECKJS_LOGGER_LEVEL=off
2. npm test
3. Check if you see the logger messages