style: add missing newline at end of ManagerSupplier file

Author: otaviojava

src/test/java/org/soujava/demos/mongodb/config/ManagerSupplier.java

@@ -26,4 +26,5 @@ public class ManagerSupplier implements Supplier<DatabaseManager> {
     public MongoDBDocumentManager get() {
         return DatabaseContainer.INSTANCE.get("hotel");
     }
+
 }