Remove apache license appendix

[stmtk1]

issue

• add license owner and year #872
• apache license owner and year is empty. So you should add license onwer.

before

## after

[phil-opp]

It seems like the appendix isn't really required to be in the license file (see e.g. rust-lang/rust#67734). So I would prefer to just remove the appendix.

[stmtk1]

I removed apache lisence's appendix

[phil-opp]

Thanks!