Fix some issues reported by lintian

See merge request !1

Changes-By: lintian-brush
Fixes: lintian: out-of-date-standards-version
See-also: https://lintian.debian.org/tags/out-of-date-standards-version.html

Changes-By: lintian-brush
Fixes: lintian: upstream-metadata-file-is-missing
See-also: https://lintian.debian.org/tags/upstream-metadata-file-is-missing.html

Changes-By: lintian-brush
Fixes: lintian: public-upstream-key-not-minimal
See-also: https://lintian.debian.org/tags/public-upstream-key-not-minimal.html

  debian/rules: Drop --fail-missing argument to dh_missing, which is now the default.

Changes-By: lintian-brush
Fixes: lintian: package-uses-old-debhelper-compat-version
See-also: https://lintian.debian.org/tags/package-uses-old-debhelper-compat-version.html

Update to upstream version '0.2.99.4'
with Debian dir ad34c6c0609840a82a72575489c99579de912814

Update to upstream version '0.2.99.3'
with Debian dir 8417cf66a89b6f932a8f57f3e95fc2aa367a24ad

Upstream version 0.2.99.2