message: Update changelog post-release
diff: - `apollo-codegen-scala`
  - <First `apollo-codegen-scala` related entry goes here>
  - `apollo-codegen-swift`
  - - Add documentation to input structs' constructors [#1619](https://github.com/apollographql/apollo-tooling/pull/1619)
  + - <First `apollo-codegen-swift` related entry goes here>
  - `apollo-codegen-typescript`
  - <First `apollo-codegen-typescript` related entry goes here>
  - `apollo-env`
  - - Add @types/node-fetch to apollo-env deps since they are exported [#1749](https://github.com/apollographql/apollo-tooling/pull/1749)
  + - <First `apollo-env` related entry goes here>
  - `apollo-graphql`
  - <First `apollo-graphql` related entry goes here>
  - `apollo-language-server`
  - - Adds support for ReasonML to the language server [#1488](https://github.com/apollographql/apollo-tooling/pull/1488)
  + - <First `apollo-language-server` related entry goes here>
  - `apollo-tools`
  - <First `apollo-tools` related entry goes here>
  - `vscode-apollo`
  + - <First `vscode-apollo` related entry goes here>
  +
  +## `apollo@2.21.3`
  +
  +- `apollo-codegen-swift@0.35.10`
  + - Add documentation to input structs' constructors [#1619](https://github.com/apollographql/apollo-tooling/pull/1619)
  +- `apollo-env@0.6.1`
  + - Add @types/node-fetch to apollo-env deps since they are exported [#1749](https://github.com/apollographql/apollo-tooling/pull/1749)
  +- `apollo-language-server@1.18.0`
  + - Adds support for ReasonML to the language server [#1488](https://github.com/apollographql/apollo-tooling/pull/1488)
  +- `vscode-apollo@1.13.0`
  - Adds syntax highlighting for ReasonML [#1488](https://github.com/apollographql/apollo-tooling/pull/1488)
  ## `apollo@2.21.2`
  