Fix NEW package list parsing

Apparently on https://ftp-master.debian.org/new.822, a Version field can hold multiple values separated by a space.

Such as:

Source: rust-uucore
Binary: librust-uucore+data-encoding-dev, librust-uucore+encoding-dev, librust-uucore+entries-dev, librust-uucore+failure-derive-dev, librust-uucore+failure-dev, librust-uucore+lazy-static-dev, librust-uucore+nix-dev, librust-uucore+platform-info-dev, librust-uucore+time-dev, librust-uucore+utmpx-dev, librust-uucore+zero-copy-dev, librust-uucore-dev
Version: 0.0.4-1 0.0.2-1 0.0.1-1
Architectures: source, amd64
Age: 7 months
Last-Modified: 1578081103
Queue: new
Maintainer: Debian Rust Maintainers <pkg-rust-maintainers@alioth-lists.debian.net>
Changed-By: Sylvestre Ledru <sylvestre@debian.org>
Distribution: unstable
Fingerprint: B60DB5994D39BEC4D1A95CCF7E6528DA752F1BE1
Changes-File: rust-uucore_0.0.4-1_amd64.changes

NEW upload detection needs to take that into account.