Formatter: Place JSX closing tag on new line

<!-- BUGS: Please use this template. --> <!-- QUESTIONS: This is not a general support forum! Ask Qs at http://stackoverflow.com/questions/tagged/typescript --> <!-- SUGGESTIONS: See https://github.com/Microsoft/TypeScript-wiki/blob/master/Writing-Good-Design-Proposals.md --> <!-- Please try to reproduce the issue with `typescript@next`. It may have already been fixed. --> **TypeScript Version:** 2.7.0-dev.20180108 **Code** ```ts <div> wat</div> ``` **Expected behavior:** ```ts <div> wat </div> ``` **Actual behavior:** No changes are made by the formatter. **Related:** While not directly related, I came across this while working on a fix for #20766. I can work on a fix for this issue as well.