testing-markdown.md

diff

 var remark = require('remark');
 var report = require('vfile-reporter');

 remark()
+  .use(require('remark-preset-lint-recommended'))
   .process('_Emphasis_ and **importance**', function (err, file) {
     console.error(report(err || file));
   });

 var remark = require('remark');
 var report = require('vfile-reporter');

 remark()
+  .use(require('remark-preset-lint-recommended'))
-  .process('_Emphasis_ and **importance**', function (err, file) {
     console.error(report(err || file));
   });