Doesn't make <br> tags using current version of Editor.js #19

[RyoYamashiro]

Hi, i appreciate your library. It's a big help for me.
But something goes wrong with using current version of Editor.js(ver 2.27.2).

Issue
When I insert line break in table and using save method in Editore.js, There is no
tag in result of save method.
Older version of Editor.js makes <br> tag.

const editor = new EditorJS({
  tools: {
    onChange: function () {
       editor.save().then(function (result) {
          console.log(JSON.stringify(result));
       }
    }
  }
}

Result
Current version(ver 2.27.2, as well as New version)

Old version(ver 2.19.3)

Thank you for reading this.

[likeuwill]

Fix #103 (comment)