Add possibility to automatically add date

[Franziskus1988]

It would be really nice, if it would be possible to automatically add e.g. current year instead of using hard coded values.

In VSCode there is the possibility to use e.g. $CURRENT_YEAR in the snippets.

[hubgit]

You can do this with a template and a variable:

// eslintrc.js

const year = new Date().getFullYear()

module.exports = () => {
  "rules": {
        "header/header": [2, "block", [
            {"pattern": " Copyright \\d{4}", "template": ` Copyright ${year}`}, 
            "My Company"
        ]]
    }
}

[robross0606]

An ideal way to get the information needed for a proper copyright statement would be to analyze git history for the file.

[tonyganchev]

Similar request as #38. ESLint 9 and JS configs for older versions solves this.