v3.0.0

Release notes:

• Switched to using Clasp command-line utility for managing Google App Script projects; instead of editing the files directly on Google Apps Script Editor
• Modularized the code by splitting it into multiple files.
• Slight optimizations

Full Changelog: v2.0.0...v3.0.0

v2.0.0

Google Apps Script recently switched from using Mozilla's Rhino to Google's V8 engine. This introduced a lot of modern JavaScript features to Apps Script syntax that were previously missing.
The coupon tracking script has been re-written so that it takes benefit of these added JavaScript features.
The old script has also been preserved.

Full Changelog: v1.0.0...v2.0.0

Initial version of coupon tracking script

v1.0.0

Create send_mail.gs