String htmlRender = new HtmlRender("Changelog", "http://deepoove.com/swagger-diff/stylesheets/demo.css");
FileOutputStream outputStream = new FileOutputStream("testDiff.html");
OutputStreamWriter outputStreamWriter = new OutputStreamWriter(outputStream);
htmlRender.render(diff, outputStreamWriter);

JsonRender markdownRender = new MarkdownRender();
FileOutputStream outputStream = new FileOutputStream("testDiff.md");
OutputStreamWriter outputStreamWriter = new OutputStreamWriter(outputStream);
markdownRender.render(diff, outputStreamWriter);

JsonRender asciidocRender = new AsciidocRender();
FileOutputStream outputStream = new FileOutputStream("testDiff.adoc");
OutputStreamWriter outputStreamWriter = new OutputStreamWriter(outputStream);
asciidocRender.render(diff, outputStreamWriter);