bug #1360 Fix UseStatementGenerator usage in MakeFixtures.php (beesofts)

This PR was merged into the 1.x-dev branch.

Discussion
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Fix UseStatementGenerator usage in MakeFixtures.php

UseStatement is not used as it should

Commits
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b25fef4 Fix UseStatementGenerator usage in MakeFixtures.php

src/Maker/MakeFixtures.php

@@ -55,8 +55,8 @@ public function generate(InputInterface $input, ConsoleStyle $io, Generator $gen
         );
 
         $useStatements = new UseStatementGenerator([
-            Fixture::class => null,
-            ObjectManager::class => null,
+            Fixture::class,
+            ObjectManager::class,
         ]);
 
         $generator->generateClass(