Added step to Dependency Update (#7675)
Added step to Dependency Update (#7675)

* Added step to Dependency Update

Just running `yarn add --dev @quasar/app@^2.0.0` does not install the latest version, but version 2.0.0 which does not work (`quasar dev` results in a build failure error). Running `quasar upgrade -i` picked up, for me, 2.0.8 which fixed the issues.

* Update app-upgrade-guide.md

Co-authored-by: Razvan Stoenescu <5ced39d27860b435bebb748c5dedb4e40f3b0e82@gmail.com>
rstoenescu/quasar-framework,quasarframework/quasar,quasarframework/quasar,rstoenescu/quasar-framework,rstoenescu/quasar-framework,quasarframework/quasar,quasarframework/quasar