chore(namespace): rewirtten namspeace from app to GitContributionGraph.

src/Service/ContributionStore.php

@@ -2,10 +2,10 @@
 
 declare(strict_types=1);
 
-namespace App\Service;
+namespace GitContributionGraph\Service;
 
-use App\Entity\Contribution;
-use App\Entity\ContributionCollection;
+use GitContributionGraph\Entity\Contribution;
+use GitContributionGraph\Entity\ContributionCollection;
 use PDO;
 
 class ContributionStore