v1.1.0 - add `major-java-version`

What's Changed

• Add a major-java-version param as an alternative to reading .tool-versions by @rtyley in #1

Full Changelog: v1.0.0...v1.1.0

git tag v1.1.0 && git push origin v1.1.0
git tag -f v1 v1.1.0 && git push origin v1 -f

v1.0.0

Initial version of this action which uses reasonable defaults for the Guardian and sets up Java and sbt.