message: Add changelog entries for federation updates
diff: ## Upcoming
  - `apollo`
  - - <First `apollo` related entry goes here>
  + - Leverage updates to apollo-language-server to support federated services [#1251](https://github.com/apollographql/apollo-tooling/pull/1251)
  + - Add `service:delete` command for deleting federated services [#1251](https://github.com/apollographql/apollo-tooling/pull/1251)
  - `apollo-codegen-core`
  - <First `apollo-codegen-core` related entry goes here>
  - `apollo-codegen-flow`
  - `apollo-codegen-typescript`
  - <First `apollo-codegen-typescript` related entry goes here>
  - `apollo-env`
  - - <First `apollo-env` related entry goes here>
  + - Add new utils and predicates [#1251](https://github.com/apollographql/apollo-tooling/pull/1251)
  - `apollo-graphql`
  - - <First `apollo-graphql` related entry goes here>
  + - Require graphql@^14.2.1 [#1251](https://github.com/apollographql/apollo-tooling/pull/1251)
  + - Add buildSchemaFromSDL and related utilities for constructing partial schemas
  + [#1251](https://github.com/apollographql/apollo-tooling/pull/1251)
  + - Add transformSchema and related utilities for easily transforming schemas
  + [#1251](https://github.com/apollographql/apollo-tooling/pull/1251)
  - `apollo-language-server`
  - - <First `apollo-language-server` related entry goes here>
  + - Extend Engine API for federated schema uploads and checks [#1251](https://github.com/apollographql/apollo-tooling/pull/1251)
  + - Reorganize files and exports [#1251](https://github.com/apollographql/apollo-tooling/pull/1251)
  - `apollo-tools`
  - <First `apollo-tools` related entry goes here>
  - `vscode-apollo`
  