8.x-1.0-alpha1

This first alpha release is compatible with the Alpha6 release of Search API Solr: https://www.drupal.org/project/search_api_solr/releases/8.x-1.0-alpha6

Search API Solr will soon have a Beta release which will trigger another release of Search API Pantheon to accommodate a refactoring of plugins: See https://www.drupal.org/node/2821771