Update jasp-qml-guide.md
Update jasp-qml-guide.md

Update old unavailable guide link (`jasp-upgrade-json` to `Upgrades.qml`)
boutinb/jasp-desktop,jasp-stats/jasp-desktop,jasp-stats/jasp-desktop,boutinb/jasp-desktop,jasp-stats/jasp-desktop,boutinb/jasp-desktop,jasp-stats/jasp-desktop,jasp-stats/jasp-desktop,jasp-stats/jasp-desktop,boutinb/jasp-desktop,jasp-stats/jasp-desktop,boutinb/jasp-desktop,boutinb/jasp-desktop,boutinb/jasp-desktop,boutinb/jasp-desktop,jasp-stats/jasp-desktop