Log Message:
www/ruby-jekyll-sass-converter: update to 2.1.0

Update ruby-jekyll-sass-converter to 2.1.0.

pkgsrc change: add "USE_LANGUAGES=	# none".

2.1.0 / 2020-02-05

Development Fixes

* chore(ci): use Ubuntu 18.04 (bionic) (#100)

Minor Enhancements

* Fix Scss#sass_dir_relative_to_site_source logic (#99)