Update fossa link to custom project
The project created is the target of the analysis after it gets merged.
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-[![FOSSA Status](https://app.fossa.io/api/projects/git%2Bgithub.com%2Fkubevirt%2Fkubevirt.svg?type=shield)](https://app.fossa.io/projects/git%2Bgithub.com%2Fkubevirt%2Fkubevirt?ref=badge_shield)
+[![FOSSA Status](https://app.fossa.com/api/projects/custom%2B13072%2Fgit%40github.com%3Akubevirt%2Fkubevirt.git.svg?type=shield)](https://app.fossa.com/projects/custom%2B13072%2Fgit%40github.com%3Akubevirt%2Fkubevirt.git?ref=badge_shield)
**KubeVirt** is a virtual machine management add-on for Kubernetes.
The aim is to provide a common ground for virtualization solutions on top of
