Update LICENSE to apache v2

[muuki88]

As discussed in #1653 sbt-native-packager will adapt the Apache v2 License and no longer require the lightbend CLA to be signed by contributors

[dwickern]

Should we remove LICENSE.md?

[mzuehlke]

And what about the build.sbt: https://github.com/sbt/sbt-native-packager/blob/main/build.sbt#L96 ?

[dwickern]

And what about the build.sbt: https://github.com/sbt/sbt-native-packager/blob/main/build.sbt#L96 ?

Good catch, I opened #1662 with those changes

[muuki88]

Thanks @mzuehlke for taking a look and making this right 🙏 and thanks for the quick fix @dwickern 😍