Mention graphql-core min version bump
- Added `validation.cost_validator` query validator that allows developers to limit maximum allowed query cost/complexity.
- Removed default literal parser from `ScalarType` because GraphQL already provides one.
- Added `extensions` and `introspection` configuration options to Django view.
+- Updated requirements list to require `graphql-core` 3.
## 0.11.0 (2020-04-01)
