Fix the class name for fossil repositories

src/Composer/Repository/RepositoryFactory.php

@@ -121,7 +121,7 @@ class RepositoryFactory
         $rm->setRepositoryClass('git', 'Composer\Repository\VcsRepository');
         $rm->setRepositoryClass('gitlab', 'Composer\Repository\VcsRepository');
         $rm->setRepositoryClass('svn', 'Composer\Repository\VcsRepository');
-        $rm->setRepositoryClass('fossil', 'Composer\Repository\FossilRepository');
+        $rm->setRepositoryClass('fossil', 'Composer\Repository\VcsRepository');
         $rm->setRepositoryClass('perforce', 'Composer\Repository\VcsRepository');
         $rm->setRepositoryClass('hg', 'Composer\Repository\VcsRepository');
         $rm->setRepositoryClass('artifact', 'Composer\Repository\ArtifactRepository');