Replace "stringUp" dependency, since it doesn't have any license

[heidemn-faro]

Hi there, Thanks for providing this package, and for offering it under the permissive MIT license.

When reviewing our OSS licenses, we got aware that a sub-dependency doesn't have any license. https://github.com/etgryphon/stringUp/issues/3 (open for > 1 year)

https://opensource.stackexchange.com/a/1721

If a repository has no license, then all rights are reserved and it is not Open Source or Free. You cannot modify or redistribute this code without explicit permission from the copyright holder. If you find software that doesn’t have a license, that generally means you have no permission from the creators of the software to use, modify, or share the software.

Would it be possible to replace stringUp with a different library that has a proper license?