Accepting configuration via package.json

[scripthunter7]

Many libraries (for example, lint-staged) allow configurations to be read directly from package.json without requiring a separate configuration file.

For some users, this behavior is more convenient as it helps keep their project structure more organized: while package.json is always required, additional configuration files can be avoided.

Therefore, I propose adding similar functionality to AGLint. Essentially, we would read the value under the "aglint" field in package.json the same way we read it from aglintrc.json.