[Merge] ~hyask/ubuntu-release-upgrader:skia/update_release_announcements into ubuntu-release-upgrader:ubuntu/main

[Skia]

Well, it's been a while, and nobody complained about those changes, so I guess we can just merge them :-)
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https://code.launchpad.net/~hyask/ubuntu-release-upgrader/+git/ubuntu-release-upgrader/+merge/475104
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