Revert "Update README.md"

This reverts commit a1258e639f2fec74310a6a2755724e518616cfe1.
Revert a1258e6..4fa74ca

This rolls back to commit a1258e639f2fec74310a6a2755724e518616cfe1.
garbage change
Revert a1258e6..69407e8

This rolls back to commit a1258e639f2fec74310a6a2755724e518616cfe1.
Bug fix: doctype 5 -> doctype html

Fixed bug.
`doctype 5` is deprecated, you must now use `doctype html`