test-generator: address yojson deprecations

exercism / ocaml

Exercism exercises in OCaml.

https://exercism.org/tracks/ocaml

MIT License

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Closed marionebl closed 5 years ago

marionebl commented 5 years ago

Avoid using Yojson.Basic.json directly to maintain forward compatibility. Also gets rid of warnings in ci output such as:

Warning 3: deprecated: Yojson.Basic.json

json types are being renamed and will be removed in the next Yojson major version. Use type t instead