Update README.md

README.md

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-This is an example GitHub App that adds a label to all new issues opened in a repository. You can follow the "[Using the GitHub API in your app](https://developer.github.com/apps/quickstart-guide/using-the-github-api-in-your-app)" quickstart guide on developer.github.com to learn how to build the app code in `server.rb`.
+This is an example GitHub App that adds a label to all new issues opened in a repository. You can follow the "[Using the GitHub API in your app](https://developer.github.com/apps/quickstart-guides/using-the-github-api-in-your-app/)" quickstart guide on developer.github.com to learn how to build the app code in `server.rb`.
 
 This project listens for webhook events and uses the Octokit.rb library to make REST API calls. This example project consists of two different servers:
 * `template_server.rb` (GitHub App template code)
 * `server.rb` (completed project)
 
-To learn how to set up a template GitHub App, follow the "[Setting up your development environment](https://developer.github.com/apps/quickstart-guide/setting-up-your-development-environment)" quickstart guide on developer.github.com.
+To learn how to set up a template GitHub App, follow the "[Setting up your development environment](https://developer.github.com/apps/quickstart-guides/setting-up-your-development-environment/)" quickstart guide on developer.github.com.
 
 ## Install