Blender does not provide an AppStream Metadata file. This makes life harder for downstream packagers like Linux distros and Flathub, since each one of them must re-invent the wheel with their own information about Blender. This also fragments Blender's branding because it gives up control of key information about the software to others. If you provided an AppStream Metadata package, downstream packagers would use it and you would remain in more control of your branding and presentation on those platforms.
I'm attaching an AppStream file you can use, taken from https://github.com/flathub/org.blender.Blender/blob/master/org.blender.Blender.appdata.xml and modified to include the correct ID and a changelog for the 2.79 version. Please feel free to incorporate this file and update it accordingly for future releases. This makes life easier for downstream packagers like Linux distros and Flathub.