Update upgrade.md
Update upgrade.md
laravel-china/laravel-docs,ryanwinchester/laravel-docs,chenrenzhen/laravel-docs-china,khs1994-gitbook/laravel-docs,ryanwinchester/laravel-docs,tusharvikky/docs,tusharvikky/docs,xpressengine/laravel-korean-docs,iwzh/laravel-docs,xpressengine/laravel-korean-docs,iwzh/laravel-doc-offline