Laravel 5.8.16 has recently been added with the all-new migration events, along with the renderable contract to the MailMessage class. The renderable contract was added to MailMessage in order to simplify the previewing of the mail notification on a browser.
The entire list of fixes made under this particular update can be explored in the news source link shared below. You can also check on to the full release notes of Laravel 5.8 on GitHub 5.8 changelog.
News Source: http://bit.ly/2VsXyYz