Version 1.0.0 Release

This is the first release of good-first-issues. See the repository for details:

https://github.com/rseng/good-first-issues

Example usage for this release is:

    steps:
    - name: Checkout Code
      uses: actions/checkout@v2
    - name: Generate First Issues
      uses: rseng/good-first-issues@v1.0.0
      with:
        repos-file: '.github/repos.txt'
        token: ${{ secrets.GITHUB_TOKEN }}

where repos-file is optional, and defaults to repos.txt in the base of the repository.