v0.1.0

packaging: extend endesive workaround with certifi and fonttools

endesive's bundled PyPDF2_annotate / email / verify modules import
`certifi` and `fontTools` alongside `attr` without declaring them in
pyproject.toml. Extend the existing attrs workaround to pull both in
explicitly, in the Fedora specs and the Debian control files for
sigillum and python3-endesive.