📚 Fix MarkDown formatting in README.md
📚 Fix MarkDown formatting in README.md

GitHub is using a formal specification for the MarkDown grammar starting March 2017, the current README.md does not adhere to this specification (https://github.com/blog/2333-a-formal-spec-for-github-flavored-markdown).
fbwiki/editor-helper-chrome-extension,fbwiki/editor-helper-chrome-extension