marked as unsupported

Just upgrade to 3.1

I invite you to read https://www.centarro.io/blog/revisiting-semantic-versioning-drupal-commerce which explains our approach re: semantic versioning.
I can probably still mark 3.0.2 as supported though if that causes issues.

thank you.
@jsacksick I read your link(I did not know) and the release notes of V3.1.
seems that updating to 3.1 does probably not brake anything.
but it is not risky to run V3.0 until individual testing of V3.1 is done.

No it shouldn't break anything.