License issue

[SchrodingerZhu]

Hi,
I understand your intention to set this project free of licensing issues. However, while being a good attempt to dedicating public domain, unlicense seems to have problems that effectively blocks the usage of the code under sensitive situations.

https://softwareengineering.stackexchange.com/questions/147111/what-is-wrong-with-the-unlicense

I do not mean to be offensive but I would like to ask ,if there is any chance, would you consider multi licensing the code under other permissive license such as Apache 2.0 or MIT that is widely accepted by wider communities.

Sorry for bothering you on this. Thanks for the excellent work anyway.