feat(release): automatically close 'out-of-date' issue
Check if there's an 'out-of-date' issue opened for the package via bumpbuddy's API.
If there's one, compare the reported upstream_version to the package's $pkgver (via vercmp).
If the package's $pkgver is equal or newer than the reported upstream_version, then add Closes "issue_url" to commitpkg's message.
Closes #285
Edited by Robin Candau