Incompatible htop license change

[natoscott]

Hi @bartoll - you've listed this github repository as Apache-2.0 licensed and it includes a build of the htop-3.0.5 sources. These sources are made available under the GPLv2 license, which is incompatible with Apache-2.0. Could you update the license on this repository accordingly please?

References:
http://www.apache.org/licenses/GPL-compatibility.html
https://www.whitesourcesoftware.com/resources/blog/top-10-apache-license-questions-answered/#5_Is_the_Apache_License_compatible_with_the_GNU_GPL

Many thanks!

--
Nathan (on behalf of the htop maintainers)