v1.19.6

What's Changed

• GC-817/adds documentation for self_mailer.viewed event by @juanfriss in #437
• [GC-894] Add qr_codes to self mailer api docs. by @ronakshahlob in #438
• Create version for qr code in selfmailers by @ronakshahlob in #439

New Contributors

• @ronakshahlob made their first contribution in #438

Full Changelog: v1.19.5...v1.19.6