Fix initializer methods

src/de/steamwar/linkage/LinkageProcessor.java

@@ -154,6 +154,7 @@ public class LinkageProcessor extends AbstractProcessor {
             buildPlan.addField(new FieldBuilder(typeElement.getSimpleName().toString(), typeElement.getSimpleName().toString()));
 
             MethodBuilder initializer = new MethodBuilder(typeElement.getSimpleName().toString(), typeElement.getSimpleName().toString());
+            initializer.setPrivate(true);
             initializer.addLine("if (" + typeElement.getSimpleName().toString() + " == null) {");
             initializer.addLine("    " + typeElement.getSimpleName().toString() + " = new " + typeElement.getSimpleName().toString() + "();");
             initializer.addLine("}");