Update for latest simple-html-tokenizer version

Resolves https://github.com/tildeio/htmlbars/issues/197 (at least all the tests pass).  I assumed we want to use `char-refs/full` rather than `char-refs/min`.  If we wanted to use `min` instead we'd need to modify the `fragment` test `converts entities to their char/string equivalent`, because it uses `&NotGreaterFullEqual;` which causes it to fail with `min`.