Sign release files.

scripts/release

@@ -23,10 +23,11 @@ git push github $version
 rm -fr dist
 python3 setup.py bdist_wheel
 python3 setup.py sdist
+gpg --detach-sign --armor dist/*
 twine upload -r pypi dist/borgmatic-*.tar.gz
 twine upload -r pypi dist/borgmatic-*-py3-none-any.whl
 
-# Set release changelogs on projects.evoworx.org and GitHub.
+# Set release changelogs on projects.torsion.org and GitHub.
 release_changelog="$(cat NEWS | sed '/^$/q' | grep -v '^\S')"
 escaped_release_changelog="$(echo "$release_changelog" | sed -z 's/\n/\\n/g' | sed -z 's/\"/\\"/g')"
 curl --silent --request POST \