minor #11288 [API] Update UPGRADE-1.8 file after adding ApiBundle (GSadee)
minor #11288 [API] Update UPGRADE-1.8 file after adding ApiBundle (GSadee)

This PR was merged into the 1.8-dev branch.

Discussion
----------

| Q               | A
| --------------- | -----
| Branch?         | master
| Bug fix?        | no
| New feature?    | no
| BC breaks?      | no
| Deprecations?   | no
| Related tickets | 
| License         | MIT


Commits
-------

443c18253d0681d7d8d2a37be7f9011b296005a8 [API] Update UPGRADE-1.8 file after adding ApiBundle

Sylius/Sylius,GSadee/Sylius,pjedrzejewski/Sylius,lchrusciel/Sylius,GSadee/Sylius,GSadee/Sylius,pjedrzejewski/Sylius,pjedrzejewski/Sylius,pjedrzejewski/Sylius,loic425/Sylius,101medialab/Sylius,Arminek/Sylius,mbabker/Sylius,diimpp/Sylius,101medialab/Sylius,foobarflies/Sylius,Zales0123/Sylius,mbabker/Sylius,kayue/Sylius,foobarflies/Sylius,Zales0123/Sylius,pamil/Sylius,SyliusBot/Sylius,101medialab/Sylius,Arminek/Sylius,Sylius/Sylius,SyliusBot/Sylius,antonioperic/Sylius,foobarflies/Sylius,mbabker/Sylius,diimpp/Sylius,loic425/Sylius,pamil/Sylius,Zales0123/Sylius,kayue/Sylius,mbabker/Sylius,SyliusBot/Sylius,foobarflies/Sylius,Sylius/Sylius,diimpp/Sylius,lchrusciel/Sylius,lchrusciel/Sylius,pamil/Sylius,kayue/Sylius,loic425/Sylius,Arminek/Sylius,antonioperic/Sylius,antonioperic/Sylius