CHANGES:

• Support __typename on subscriptions (#178)
• Handle unknown fields for subscriptions (#178)
• Add ocamlformat (#177)
• Handle missing variables as null (#184)
• Show default value in introspection query (#194)
• Support block strings in the parser (#198)
• Handle skip/include directives on fragment spreads (#200)
• Improved handling of recursive arguments and objects (#199)
• Fix websocket conflict (#206)
• Update deprecated Fmt functions (#206)
• Use Yojson t types instead of deprecated json type (#208)
• Raise minimum rresult version (#209)