v2.1.0

• Switched to the slim variant of upstream images (instead of alpine)
• Added Solr v7.7 and v8.1
• docksal/solr:latest matches docksal/solr:8.1
• Switched to search_api_solr_8.x-3.0 config sets
• Updated README.md

v2.0.0

• Switched to official Apache Solr images as the base
• Dropped Solr 3 and Solr 4 (EOL)
  • The latest available images for Docksal are docksal/1.0-solr3 and docksal/1.0-solr4 respectively
• Added Solr 5.5, 6.6 and 7.5
• Drupal config sets support for Search API Solr and ApacheSolr modules
• Refactored build process
• Updated README and LICENSE year

v1.0.0

Initial release