Update UPGRADING.md
Update UPGRADING.md

In some places is Steam instead Stream
michabbb-backup/guzzle,Tony133/guzzle,mikicaivosevic/guzzle,phlogisticfugu/guzzle,mustafavelioglu/guzzle,jeskew/guzzle,sulfo/guzzle,mikicaivosevic/guzzle,guzzle/guzzle,rajaehtesham/guzzle,grokify/guzzle,Tony133/guzzle,videni/guzzle,mortenhauberg/guzzle,atrauzzi/guzzle,phlogisticfugu/guzzle,mrm/guzzle,cenxun/guzzle,stefanruijsenaars/guzzle,Rinat-wc/guzzle,mortenhauberg/guzzle,thinsoldier/guzzle,staylor/guzzle,nazo/guzzle,justincy/guzzle,duyhuynhngoc/guzzle,hussainweb/guzzle,vrkansagara/guzzle,checat/guzzle,chengky/guzzle,mubassirhayat/guzzle,sulfo/guzzle,BostjanOb/guzzle,stea4lth/guzzle,videni/guzzle,Tobion/guzzle,thinsoldier/guzzle,kkopachev/guzzle,grokify/guzzle,wherefortravel/guzzle,justincy/guzzle,sahat/guzzle,lahmizzar/guzzle,ehough/guzzle,cenxun/guzzle,dshafik/guzzle,Naktibalda/guzzle,EdgarPE/guzzle,rajaehtesham/guzzle,Brunty/guzzle,Tobion/guzzle,EdgarPE/guzzle,wherefortravel/guzzle,stea4lth/guzzle,duyhuynhngoc/guzzle,BostjanOb/guzzle,mrm/guzzle,checat/guzzle,atrauzzi/guzzle,javierTerry/guzzle,Briareos/guzzle,mustafavelioglu/guzzle,WebSeed/guzzle,kkopachev/guzzle,chengky/guzzle,javierTerry/guzzle,nazo/guzzle,jeskew/guzzle,paveljanda/guzzle,lahmizzar/guzzle,WebSeed/guzzle,stefanruijsenaars/guzzle,Briareos/guzzle,staylor/guzzle,michabbb-backup/guzzle,Rinat-wc/guzzle,paveljanda/guzzle,Brunty/guzzle,guzzle/guzzle,ehough/guzzle,Naktibalda/guzzle,dshafik/guzzle,hussainweb/guzzle,vrkansagara/guzzle