feat(docs): update upgrade guide (mention v2.4.0's new features)
feat(docs): update upgrade guide (mention v2.4.0's new features)

quasarframework/quasar,quasarframework/quasar,rstoenescu/quasar-framework,rstoenescu/quasar-framework,rstoenescu/quasar-framework,quasarframework/quasar,quasarframework/quasar