Update vulnerabilities/models.py

Signed-off-by: Shivam Sandbhor <shivam.sandbhor@gmail.com>

Author: sbs2001

vulnerabilities/models.py

@@ -145,7 +145,7 @@ class PackageRelatedVulnerability(models.Model):
     is_vulnerable = models.BooleanField()
 
     def __str__(self):
-        return self.package.package_url + " " + self.vulnerability.cve_id
+        return f"{self.package.package_url} {self.vulnerability.cve_id}"
 
     class Meta:
         unique_together = ("package", "vulnerability")