message: Update CHANGELOG for 2.28.3
diff: ## Upcoming
  - `apollo`
  - - Don't send a user-specified frontend URL to Apollo's servers; fetch one when needed. Drop `--frontend` flag. [#1990](https://github.com/apollographql/apollo-tooling/pull/1990)
  + - <First `apollo` related entry goes here>
  - `apollo-codegen-flow`
  - <First `apollo-codegen-flow` related entry goes here>
  - `apollo-codegen-scala`
  - `apollo-graphql`
  - <First `apollo-graphql` related entry goes here>
  - `apollo-language-server`
  - - Don't send a user-specified frontend URL to Apollo's servers; fetch one when needed. [#1990](https://github.com/apollographql/apollo-tooling/pull/1990)
  + - <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@2.28.3`
  +
  +- `apollo@2.28.3`
  + - Don't send a user-specified frontend URL to Apollo's servers; fetch one when needed. Drop `--frontend` flag. [#1990](https://github.com/apollographql/apollo-tooling/pull/1990)
  +- `apollo-language-server@1.22.3`
  + - Don't send a user-specified frontend URL to Apollo's servers; fetch one when needed. [#1990](https://github.com/apollographql/apollo-tooling/pull/1990)
  +
  ## `apollo@2.28.2`
  - `apollo@2.28.2`
  