Paid Memberships Pro - Membership Card 1.1.2

* ENHANCEMENT: Added compatibility for using the [pmpro_membership_card] in custom post types
* BUG FIX: Fixed an issue when qr_data attribute was set to an invalid option.

* BUG FIX: Fixed an issue where it would always show "None" as the level even if a user had a valid level.

* BUG FIX/ENHANCEMENT: Fixed notices and warnings, general improvements.
* ENHANCEMENT: Added QR Code functionality and QR data. Attributes: `qr_code="true"` and `qr_data="email"` for example. Please see documentation for more information. Thanks @jarrydlong.
* ENHANCEMENT: Added filter to allow custom data to be added: `pmpro_membership_card_after_card`.
* ENHANCEMENT: Added filter for QR code if `"other"` is set in attribute: `pmpro_membership_card_qr_data_other` and `pmpro_membership_card_qr_code_size`.
* ENHANCEMENT: Support Multiple Memberships Per User Add On. Thanks @ronalfy