Release v4.0.0 (#561)

Co-authored-by: nflaig <38436224+nflaig@users.noreply.github.com>

Author: github-actions[bot]

CHANGES.md

@@ -6,6 +6,20 @@ These endpoints have been added or updated since the last release.
 
 There are likely to be descriptions etc outside of the list below, but new query parameters, changes to headers, new endpoints should be listed.
 
+| Endpoint                                                                                                            | [Lighthouse](https://github.com/sigp/lighthouse) | [Lodestar](https://github.com/ChainSafe/lodestar) | [Nimbus](https://github.com/status-im/nimbus-eth2) | [Prysm](https://github.com/prysmaticlabs/prysm) | [Teku](https://github.com/ConsenSys/teku) |
+|---------------------------------------------------------------------------------------------------------------------|--------------------------------------------------|---------------------------------------------------|----------------------------------------------------|-------------------------------------------------|-------------------------------------------|
+
+The Following are no longer in the Standard API, removed since the latest version.
+
+| Endpoint                                                                                                 | [Lighthouse](https://github.com/sigp/lighthouse) | [Lodestar](https://github.com/ChainSafe/lodestar) | [Nimbus](https://github.com/status-im/nimbus-eth2) | [Prysm](https://github.com/prysmaticlabs/prysm) | [Teku](https://github.com/ConsenSys/teku) |
+|----------------------------------------------------------------------------------------------------------|--------------------------------------------------|---------------------------------------------------|----------------------------------------------------|-------------------------------------------------|-------------------------------------------|
+
+## v4.0.0
+
+These endpoints have been added or updated since the last release.
+
+There are likely to be descriptions etc outside of the list below, but new query parameters, changes to headers, new endpoints should be listed.
+
 | Endpoint                                                                                                            | [Lighthouse](https://github.com/sigp/lighthouse) | [Lodestar](https://github.com/ChainSafe/lodestar) | [Nimbus](https://github.com/status-im/nimbus-eth2) | [Prysm](https://github.com/prysmaticlabs/prysm) | [Teku](https://github.com/ConsenSys/teku) |
 |---------------------------------------------------------------------------------------------------------------------|--------------------------------------------------|---------------------------------------------------|----------------------------------------------------|-------------------------------------------------|-------------------------------------------|
 | [#535](https://github.com/ethereum/beacon-APIs/pull/535) `data_column_sidecar EVENT` added        |                                                  |                                                  |                                                    |                                                 |                                           |

index.html

@@ -48,6 +48,7 @@
       // Begin Swagger UI call region
       const ui = SwaggerUIBundle({
         urls: [
+          {url: "./releases/v4.0.0/beacon-node-oapi.json", name: "v4.0.0"},
           {url: "./releases/v3.1.0/beacon-node-oapi.json", name: "v3.1.0"},
           {url: "./releases/v3.0.0/beacon-node-oapi.json", name: "v3.0.0"},
           {url: "./releases/v2.5.0/beacon-node-oapi.json", name: "v2.5.0"},