Anitya should report every found version, not only latest

[Zlopez]

Anitya is currently reporting only newest version. This should be changed to allow sending more than one version in the anitya.project.version.update topic.

For this to work we need to do some changes:

1. Upstream version needs to be changed to array in anitya.project.version.update topic
2. There also needs to be change in the-new-hotness to be able to work with this

[voxik]

Just FTR, this would be useful for Fedora modularity, which allows to have supported multiple stable streams for package, e.g. Ruby 2.4, 2.5 and 2.6 at the same time.

[Zlopez]

@voxik It shouldn't be a problem to just add Fedora Modules distribution to Anitya, so we map packages to modules.
But to make this work properly in the-new-hotness could prove difficult. I will create a issue on the-new-hotness for it.