Include Releases information in AppData.xml

[elementaryBot]

In order to provide changelogs in appcenter, we need to start making use of appdata.xml release tags. The structure is like this:

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<_li>Add a feature</_li>
<_li>Fix a bug</_li>
<_li>updated translations</_li>

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Launchpad Details: #LP1627358 Daniel Fore - 2016-09-24 18:31:27 +0000

[elementaryBot]

When reviewing branches, check for appstream validation by first building (because you can't validate .in files) and then running appstreamcli validate data/APPID.appdata.xml

Launchpad Details: #LPC Daniel Fore - 2016-09-24 18:43:54 +0000

[elementaryBot]

And this is why I love what you guys are doing. How can I help? I don't code, but I am willing to do all I can to make this happen.

Launchpad Details: #LPC Callista Graves - 2016-09-27 18:44:33 +0000

[elegaanz]

I think we are doing that now: https://github.com/elementary/music/blob/master/data/org.pantheon.noise.appdata.xml.in