Add-ons [DBTech] DragonByte User Upgrade Coupons 1.2.0

Update highlights

!!! THIS VERSION REQUIRES XENFORO 2.2.0 AND PHP 7.2.0 !!!
This version contains no changes other than coding style updates and changes for XenForo 2.2.0 / PHP 7.2.0.
Complete Change Log
Change: Update internal functions to follow new XenForo 2.1 / 2.2 coding standards
Thank You @LarryNet

Update highlights

• This version adds a constraint on the coupon code length in order to prevent a server error from being displayed.
• Complete Change Log
• Fix: Prevent a server error by constraining coupon code length