upodate changelog with file extension

Author: JakeDawkins

CHANGELOG.md

@@ -3,17 +3,17 @@
 ## Upcoming
 
 - `apollo`
-  - Add `--target=format` flag to `client:download-schema` command to download schema in desired format i.e. SDL or JSON
+  - Add tsFileExtension flag to allow custom file extension in ts (like d.ts) [#1130](https://github.com/apollographql/apollo-tooling/pull/1130)
 - `apollo-codegen-core`
-  - <First `apollo-codegen-core` related entry goes here>
+  - Add tsFileExtension option to allow custom file extension in ts (like d.ts) [#1130](https://github.com/apollographql/apollo-tooling/pull/1130)
 - `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>
+  - Add tsFileExtension option to allow custom file extension in ts (like d.ts) [#1130](https://github.com/apollographql/apollo-tooling/pull/1130)
 - `apollo-env`
   - <First `apollo-env` related entry goes here>
 - `apollo-graphql`