v2.0.0

Changelog

• Get upstream branch from github.context.ref. input-variable upstream-branch is no longer needed.

• Input-variable exclude now accepts a multiline input:

  - uses: milliHQ/gh-action-release-branch@v2.0.0
    with:
      release-branch: release
      release-tag: v1.0.0
      exclude: |
        lib/**/*
        test/**/*