3.0.0

• Updated to https://github.com/pronamic/wp-pay-core/releases/tag/4.0.0.
• Cleanup Ninja Forms session once payment has been fulfilled.

2.0.0

• Updated to pronamic/wp-pay-core version 3.0.0.
• Updated to pronamic/wp-money version 2.0.0.
• Changed TaxedMoney to Money, no tax info.
• Switched to pronamic/wp-coding-standards.