Update CHANGELOG.md

CHANGELOG.md

@@ -16,6 +16,7 @@ The version headers in this history reflect the versions of Apollo Server itself
 - `apollo-engine-reporting`: Add environment variable `APOLLO_SCHEMA_REPORTING` that can enable schema reporting. If `experimental__schemaReporting` is set it will override the environment variable. [PR #4206](https://github.com/apollographql/apollo-server/pull/4206)
 - `apollo-engine-reporting`: The schema reporting URL has been changed to use the new dedicated sub-domain `https://edge-server-reporting.api.apollographql.com`. [PR #4232](https://github.com/apollographql/apollo-server/pull/4232)
 - `apollo-server-core`: Though Apollo Server **is not affected** due to the way it is integrated, in response to [an upstream security advisory for GraphQL Playground](https://github.com/prisma-labs/graphql-playground/security/advisories/GHSA-4852-vrh7-28rf) we have published [the same patch](https://github.com/prisma-labs/graphql-playground/commit/bf1883db538c97b076801a60677733816cb3cfb7) on our `@apollographql/graphql-playground-html` fork and bumped Apollo Server to use it.  Again, this was done out of an **abundance of caution** since the way that Apollo Server utilizes `renderPlaygroundPage` is _not_ vulnerable as it does not allow per-request Playground configuration that could allow interpolation of user-input. [PR #4231](https://github.com/apollographql/apollo-server/pull/4231)
+- `apollo-engine-reporting`: Make Apollo Server throw if schema reporting is enabled for a gateway or federated service. [PR #4246](https://github.com/apollographql/apollo-server/pull/4246)
 
 ### v2.14.3