7.0.0

• Some breaking changes were made to types used for facet scraping. I have doubts that facet scraping features were being used outside of developing this package, so this is likely not a concern to anyone. If you were using facet scraping features though then you can refer to this commit for details.
• Facet scraping features are now mentioned in the README.
• LegoGraphClient.queryGraph will now retry up to 10 times if a request fails (non-2xx status code)
• The addFilter methods for the various graph query classes now return the current instance.
• QueryValuesFilter now has its own addValues method.
• Add several new filters for product search queries:
  • Product flags (e.g. hard to find, retiring soon)
  • Product availability (e.g back order, out of stock)
  • Product interest (e.g. gaming, trains)
• Added new product types:
  • Accessories (Accessories2)
  • Bottoms
  • Pets
  • Sneakers
  • Sweatshirts
  • T-Shirts
  • Valentine's Day
  • Helmets
• Added new brick colors:
  • Medium Lavendel (MediumLavendel2)
  • Sand Blue