NewCongratulator returns a new Congratulator.

NewSpreadsheetFetcher creates a SpreadsheetFetcher that can fetch usernames from the given spreadsheet.

CLAChecker can fetch and validate that pull request authors have signed a CLA.

CongratsData is the field that gets rendered into the template provided by NewCongratulator.

Congratulator congratulates new contributors, and posts a welcome message on the first PR they opened against the project.

SpreadsheetFetcher fetches data from a Google spreadsheet.

ContributorFetcher is any struct that can fetch and return a list of contributors that have signed the CLA.