Allow Regex in licenses about deno_license_checker

[kt3k]

Writing (and reading) regex in json is painful in my view. So I want to avoid allowing regex in the config.

In the above example, why some file has license header and some are not? Doesn't ignore parameter work for that case?

[Pandapip1]

ignore doesn't work since that takes in a list of files, and the repo in question mostly deals with new files.