message: Update changelog for new releases
diff: ## Upcoming
  +- `apollo`
  + - <First `apollo` related entry goes here>
  +- `apollo-codegen-core`
  + - <First `apollo-codegen-core` related entry goes here>
  +- `apollo-codegen-flow`
  + - <First `apollo-codegen-flow` related entry goes here>
  +- `apollo-codegen-scala`
  + - <First `apollo-codegen-scala` related entry goes here>
  +- `apollo-codegen-swift`
  + - <First `apollo-codegen-swift` related entry goes here>
  +- `apollo-codegen-typescript`
  + - <First `apollo-codegen-typescript` related entry goes here>
  +- `apollo-env`
  + - <First `apollo-env` related entry goes here>
  +- `apollo-graphql`
  + - <First `apollo-graphql` related entry goes here>
  +- `apollo-language-server`
  + - <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@2.18.2`
  +
  +- `apollo-codegen-core@0.35.2`
  +- `apollo-codegen-flow@0.33.27`
  +- `apollo-codegen-scala@0.34.27`
  +- `apollo-codegen-swift@0.35.7`
  +- `apollo-codegen-typescript@0.35.2`
  +- `apollo-language-server@1.15.2`
  +- `apollo@2.18.2`
  +
  - `apollo`
  - Support multiple `localSchemaFile`s [#1500](https://github.com/apollographql/apollo-tooling/pull/1500)
  - `apollo-codegen-core`
  - Fix warning in Xcode 11 when enums have a none case [#1482](https://github.com/apollographql/apollo-tooling/pull/1482)
  - `apollo-codegen-typescript`
  - Replace instanceof checks with their respective predicates [#1518](https://github.com/apollographql/apollo-tooling/pull/1518)
  -- `apollo-env`
  - - <First `apollo-env` related entry goes here>
  -- `apollo-graphql`
  - - <First `apollo-graphql` related entry goes here>
  - `apollo-language-server`
  - Replace instanceof checks with their respective predicates [#1518](https://github.com/apollographql/apollo-tooling/pull/1518)
  - Support multiple `localSchemaFile`s [#1500](https://github.com/apollographql/apollo-tooling/pull/1500)
  -- `apollo-tools`
  - - <First `apollo-tools` related entry goes here>
  -- `vscode-apollo`
  - - <First `vscode-apollo` related entry goes here>
  ## `apollo@2.18.1`
  