appdata.xml: Use a SPDX license tag

geigi / cozy

🎧 Listen to audio books 📚 on Linux

https://cozy.sh

GNU General Public License v3.0

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Closed manut closed 1 month ago

manut commented 1 month ago

According to appdata specification this shall be a SPDX tag.

rdbende commented 1 month ago

Good catch. Thanks!