tests: adjust for code move in Hypothesis 2.0.0
It appears that the Settings class was renamed to settings, and because
of this, the settings module was renamed to configuration.
https://github.com/DRMacIver/hypothesis/commit/a0e663b
test-highlight: add normalization rule for Pygments 2.1
It appears that several classes have 'h', '1', '2' suffixes on Pygments 2.1,
which is the current version on Debian sid.