Added new line between interfaces during serialization.

plugins/org.yakindu.sct.model.stext.resource/src/org/yakindu/sct/model/stext/resource/impl/StextResource.java

@@ -42,6 +42,7 @@ public class StextResource extends AbstractSCTResource {
 		StringBuilder builder = new StringBuilder();
 		for (Scope scope : statechart.getScopes()) {
 			builder.append(serialize(scope));
+			builder.append("\n");
 		}
 		statechart.setSpecification(builder.toString());
 	}