$version	$type	arc	https://github.com/unicode-org/icu/releases/download/release-$(echo $version | sed 's/\./-/')/icu4c-$(echo $version | sed 's/\./_/')-src.$type
$version	$type	sig	https://github.com/unicode-org/icu/releases/download/release-$(echo $version | sed 's/\./-/')/icu4c-$(echo $version | sed 's/\./_/')-src.$type.asc