Fixed error

src/test/java/de/unistuttgart/iste/meitrex/flashcard_service/api/MutationLogFlashcardProgressTest.java

@@ -139,4 +139,4 @@ private static GraphQlTester.Response runMutationLogFlashcardLearned(final HttpG
                 .variable("successful", success)
                 .execute();
     }
-}
+}