Rearrage order of python versions. Hopefully travisci runs versions in my specified order. Run non-dev current versions first. Latest ResourceWarning failures only show up in 3.8 and 3.9, so let them run during the first batch of 4 jobs. Then backfill with earlier versions and nightly versions. Note travis has 3.9-dev even though it's tracking a released version.

try:
    from html import escape as html_escape_  # python 3

    def html_escape(str, quote=False):
        # html_escape under python 3 sets quote to true by default
        # make it python 2 compatible
        return html_escape_(str, quote=quote)
except ImportError:
    # python 2 fallback
    from cgi import escape as html_escape  # noqa: F401