Upgrade to phpunit 9

Merge pull request #11 from OpenBuildings/upgrade-phpunit9

Upgrade PHPUnit 9

Update deps

Merge pull request #9 from OpenBuildings/update-deps

Update deps.

Upgrade to PHP 7.3

Merge pull request #8 from OpenBuildings/upgrade_phpunit

SUP-898 upgrate phpunit to 7^

0.8.0: Update to Omnipay 3, purchases 0.11, shipping 0.13, PHP 7.1+

Update to Omnipay 3, purchases 0.11, shipping 0.13, PHP 7.1+

Fix deleting existing promotions

Keep existing promotions instead of deleting it and add new promotion.

Drop PHP 5, upgrade to PHPUnit 6

Merge pull request #6 from OpenBuildings/update

Upgrade to PHPUnit 6, drop PHP 5

0.7.3: Support deleted promo codes when loading a purchase

Support deleted promo codes when loading a purchase

Updated shipping module version

0.7.2

Bumping shipping module version

Giftcard improvements

Changed giftcard price logic to be calculated proportionally for each brand purchase based on the brand purchase price in relation to the total price the promotion applies to.

Use the newest jam-auth

• Update jam auth
• Add new php versions to test against
• Fix whitespaces