Patch-release GraphQL-core v3.2.2, based on GraphQL.js v16.4.0.
This patch-releases includes the changes in [GraphQL.js v16.4.0](https://github.com/graphql/graphql-js/releases), and the following fixes:
- Require typing extensions when needed
- Recommend using poetry instead of pipenv in the docs (161)
- Cast error message to string to handle proxy objects (175)
- Remove newline in description (180)
Thanks to chenrui333, conao3, jkimbo, singingwolfboy for contributing and to all who are sponsoring me (Cito) for maintaining this project.