Book files for Black Hat GraphQL.

Enjoy!

• Page 83 Listing 4-14: grep command should be corrected to: grep -Hnio "graphiql\|graphql-playground" dvga-report/source/*
• Page 112: The sentence "In DVGA, run the following query [...]" should read: "In Altair, run the following query [...]".
• Page 177: The COOKIES variable value should read {"session":"session-secret"}