Fix CHANGELOG.md for #1971, now tentatively in 2.4.x.

CHANGELOG.md

@@ -1,8 +1,9 @@
 # Changelog
 
-### vNEXT
+### vNEXT (v2.4.0)
 
 - Implement an in-memory cache store to save parsed and validated documents and provide performance benefits for successful executions of the same document. [PR #2111](https://github.com/apollographql/apollo-server/pull/2111) (`2.4.0-alpha.0`)
+- New `apollo-server-fastify` integration ([@rkorrelboom](https://github.com/rkorrelboom) in [#1971](https://github.com/apollostack/apollo-server/pull/1971))
 - Switch from `json-stable-stringify` to `fast-json-stable-stringify`. [PR #2065](https://github.com/apollographql/apollo-server/pull/2065)
 
 ### v2.3.1
@@ -18,9 +19,9 @@
   While Node.js 6.x is covered by a [Long Term Support agreement by the Node.js Foundation](https://github.com/nodejs/Release#release-schedule) until April 2019, there are substantial performance (e.g. [V8](https://v8.dev/) improvements) and language changes (e.g. "modern" ECMAScript support) offered by newer Node.js engines (e.g. 8.x, 10.x).  We encourage _all users_ of Apollo Server to update to newer LTS versions of Node.js prior to the "end-of-life" dates for their current server version.
 
   **We intend to drop support for Node.js 6.x in the next major version of Apollo Server.**
-  
+
   For more information, see [PR #2054](https://github.com/apollographql/apollo-server/pull/2054) and [our documentation](https://www.apollographql.com/docs/apollo-server/v2/migration-file-uploads.html).
-  
+
 ### v2.2.7
 
 - `apollo-engine-reporting`: When multiple instances of `apollo-engine-reporting` are loaded (an uncommon edge case), ensure that `encodedTraces` are handled only once rather than once per loaded instance. [PR #2040](https://github.com/apollographql/apollo-server/pull/2040)
@@ -44,7 +45,6 @@ client reference ID, Apollo Server will now default to the values present in the
 of the request (`apollographql-client-name`, `apollographql-client-reference-id` and
 `apollographql-client-version` respectively).  As a last resort, when those headers are not set,
 the query extensions' `clientInfo` values will be used. [PR #1960](https://github.com/apollographql/apollo-server/pull/1960)
-- Added `apollo-server-fastify` integration ([@rkorrelboom](https://github.com/rkorrelboom) in [#1971](https://github.com/apollostack/apollo-server/pull/1971))
 
 ### v2.2.2