v4.0.0

Features

• Implement multi-tenancy and group export (#416) (a9aebcc), closes #348 #347 #367 #381 #387 #384 #389 #392 #397 #393 #398 #399 #400

  Multi-tenancy allows a single fhir-works-on-aws stack to serve as multiple FHIR servers for different tenants.
  Check out our multi-tenancy documentation for more details.

⚠ BREAKING CHANGES

• The Cognito IdToken is now used instead of the AccessToken to authorize requests.

Multi-tenancy itself is not a breaking change, you can continue to use FHIR works on single-tenant mode
by not using the enableMultiTenancy flag.

However, note that updating an existing (single-tenant) stack to enable multi-tenancy is a breaking change. Multi-tenant
deployments use a different data partitioning strategy that renders the old, single-tenant, data inaccessible.