Needed for the weblate

- Remove superfluous devel dependency for noarch package

- Use noun phrase for summary. Ensure accuracy and
neutrality of description.

- Upgrade to 2018.1.9:
Fix #188: Non-ASCII in title attribute causes encode error.
Feature #194: Add support for the tag.
Feature #193: Add support for the tag.
Fix #157: Fix images link with div wrap
Fix #55: Fix error when empty title tags
Fix #160: The html2text tests are failing on Windows and on
Cygwin due to differences in eol handling between
Windows/*nix
Feature #164: Housekeeping: Add flake8 to the travis build,
cleanup existing flake8 violations, add py3.6 and pypy3
to the travis build
Fix #109: Fix for unexpanded < > &
Fix #143: Fix line wrapping for the lines starting with bold
Adds support for numeric bold text indication in font-weight,
as used by Google (and presumably others.)
Fix #173 and #142: Stripping whitespace in crucial markdown
and adding whitespace as necessary
Don't drop any cell data on tables uneven row lengths
(e.g. colspan in use)

- Remove dependency on unittetst2
Added remove_unittest2.patch to facilitate that