Add desktop-id to Appstream Metainfo
It's needed for tools like appstream-generator to detect the associated desktop file.
<?xml version="1.0" encoding="UTF-8"?>
<component>
<id>com.github.zyedidia.micro</id>
+ <launchable type="desktop-id">micro.desktop</launchable>
<name>Micro Text Editor</name>
<summary>A modern and intuitive terminal-based text editor</summary>
<metadata_license>MIT</metadata_license>
