Adds a 'late' label to PRs which haven't been made before the end of the sprint.

1. Clone this repo

   git clone https://github.com/jack-lewin/pr-deadline

   cd pr-deadline

2. Create a new Heroku app and deploy the application

   For instructions on doing this, see 'Getting Started on Heroku with Node.js'.

3. Create a GitHub app

   On your GitHub account settings, go to 'Developer settings' -> 'OAuth Apps'.

   Click 'Register a new application' and enter relevant details.

   The authorization callback URL is https://YOUR-HEROKU-APP-NAME-HERE.herokuapp.com/auth.

4. Define the following Heroku config variables:

   OWNER - the owner of the repo.

   REPO - to name of the repo.

   CLIENT_ID - as per the GitHub app you created in step 3.

   CLIENT_SECRET - as per the GitHub app you created in step 3.

   SPRINT_END_DAY - the number of the last day of the sprint (e.g. Monday is 1) - defaults to 5 (Friday).

   SPRINT_END_HOUR - the hour PR deadline (e.g. 7pm is 19) - defaults to 12 (midday).

5. Generate an access token

   Get an access token for the app, by going to https://YOUR-HEROKU-APP-NAME-HERE.herokuapp.com.

   You'll be redirected to GitHub, where you can authorize the app to use your GitHub profile.

   You'll return to the app, and receive an access token: save this as your ACCESS_TOKEN config variable.

6. Set up a webhook for the repo

   On the GitHub repo settings, go to 'Webhooks' and click 'Add webhook'.

   Enter your Heroku app URL, and set the content-type to be application/json.

   Click 'let me select individual events', and select 'pull request'.