Fix 0.5 notice in UPGRADE.md
Fix 0.5 notice in UPGRADE.md

hubert/her,crv/her,marshall-lee/her,fandor/her,remiprev/her,zacharywelch/her,ekampp/her,spanner/her,tippenein/her,jkappers/her,ticktricktrack/her,practicefusion/her,kylezeng/her,chewi/her,dturnerTS/her,danimashu/her,mallikarjunayaddala/her,WizardOfOgz/her,valo/her,alexchumak/her