fix(docs): link to clang-format

Author: alexeagle

DEVELOPER.md

@@ -8,7 +8,7 @@ JS and Dart versions. It also explains the basic mechanics of using `git`, `node
 * [Environment Variable Setup](#environment-variable-setup)
 * [Installing NPM Modules and Dart Packages](#installing-npm-modules-and-dart-packages)
 * [Running Tests Locally](#running-tests-locally)
-* [Formatting](#formatting)
+* [Formatting](#clang-format)
 * [Project Information](#project-information)
 * [CI using Travis](#ci-using-travis)
 * [Transforming Dart code](#transforming-dart-code)