XF2 Addons [AndyB] User upgrade expired reminder 1.3

Creates a conversation when a members account upgrade has expired.

User upgrade expired reminder v1.3 changes:

Fixed issue where conversation was created even though member has recently upgraded account.

User upgrade expired v1.6 changes:

Renamed variable in phrase.

User upgrade expired reminder v1.2 changes:

The conversation message now shows account upgrade title which has expired.