Update scripts/update/update.py
Update scripts/update/update.py

Add exists action to pip.
anaran/olympia,tsl143/zamboni,harry-7/addons-server,Prashant-Surya/addons-server,Joergen/zamboni,mudithkr/zamboni,luckylavish/zamboni,clouserw/zamboni,Revanth47/addons-server,tsl143/addons-server,beni55/olympia,yfdyh000/olympia,kmaglione/olympia,yfdyh000/olympia,kumar303/addons-server,anaran/olympia,elysium001/zamboni,Hitechverma/zamboni,wagnerand/addons-server,jasonthomas/zamboni,eviljeff/olympia,diox/olympia,jasonthomas/zamboni,mudithkr/zamboni,jpetto/olympia,Hitechverma/zamboni,tsl143/addons-server,harry-7/addons-server,shahbaz17/zamboni,muffinresearch/olympia,diox/olympia,lavish205/olympia,mudithkr/zamboni,kmaglione/olympia,eviljeff/zamboni,ingenioustechie/zamboni,mstriemer/olympia,wagnerand/zamboni,mozilla/zamboni,mstriemer/olympia,Joergen/olympia,washort/zamboni,robhudson/zamboni,elysium001/zamboni,Prashant-Surya/addons-server,andymckay/zamboni,wagnerand/olympia,muffinresearch/addons-server,ayushagrawal288/zamboni,diox/zamboni,mrrrgn/olympia,Prashant-Surya/addons-server,Jobava/zamboni,magopian/olympia,harikishen/addons-server,kumar303/zamboni,jamesthechamp/zamboni,wagnerand/zamboni,mozilla/zamboni,koehlermichael/olympia,washort/zamboni,mstriemer/olympia,andymckay/zamboni,eviljeff/zamboni,andymckay/olympia,mozilla/addons-server,Nolski/olympia,robhudson/zamboni,atiqueahmedziad/addons-server,eviljeff/zamboni,koehlermichael/olympia,psiinon/addons-server,ngokevin/zamboni,ngokevin/zamboni,bqbn/addons-server,luckylavish/zamboni,yfdyh000/olympia,wagnerand/addons-server,ddurst/zamboni,ddurst/zamboni,wagnerand/addons-server,mozilla/olympia,ddurst/zamboni,clouserw/zamboni,wagnerand/zamboni,andymckay/addons-server,muffinresearch/addons-server,mozilla/addons-server,andymckay/olympia,psiinon/addons-server,mdaif/olympia,jpetto/olympia,Joergen/zamboni,elysium001/zamboni,Hitechverma/zamboni,johancz/olympia,shahbaz17/zamboni,Joergen/zamboni,ayushagrawal288/zamboni,mstriemer/olympia,Joergen/zamboni,Joergen/olympia,beni55/olympia,bqbn/addons-server,beni55/olympia,spasovski/zamboni,SuriyaaKudoIsc/olympia,jamesthechamp/zamboni,psiinon/addons-server,Witia1/olympia,andymckay/zamboni,bqbn/addons-server,spasovski/zamboni,ddurst/zamboni,Witia1/olympia,kumar303/addons-server,andymckay/addons-server,Joergen/olympia,shahbaz17/zamboni,magopian/olympia,eviljeff/olympia,kmaglione/olympia,atiqueahmedziad/addons-server,clouserw/zamboni,muffinresearch/olympia,Jobava/zamboni,harikishen/addons-server,psiinon/addons-server,kmaglione/olympia,diox/zamboni,harikishen/addons-server,washort/zamboni,luckylavish/zamboni,magopian/olympia,spasovski/zamboni,shahbaz17/zamboni,kumar303/addons-server,kumar303/olympia,crdoconnor/olympia,crdoconnor/olympia,mstriemer/zamboni,ingenioustechie/zamboni,eviljeff/olympia,koehlermichael/olympia,luckylavish/zamboni,kumar303/olympia,wagnerand/olympia,ingenioustechie/zamboni,mrrrgn/olympia,ayushagrawal288/zamboni,diox/zamboni,Nolski/olympia,koehlermichael/olympia,Joergen/zamboni,washort/zamboni,mdaif/olympia,mozilla/olympia,clouserw/zamboni,johancz/olympia,wagnerand/addons-server,muffinresearch/addons-server,andymckay/addons-server,jpetto/olympia,bqbn/addons-server,andymckay/olympia,mozilla/addons-server,Joergen/zamboni,beni55/olympia,magopian/olympia,kumar303/zamboni,mdaif/olympia,harikishen/addons-server,mstriemer/zamboni,SuriyaaKudoIsc/olympia,jamesthechamp/zamboni,Revanth47/addons-server,mstriemer/addons-server,Joergen/olympia,mozilla/zamboni,robhudson/zamboni,yfdyh000/olympia,crdoconnor/olympia,ngokevin/zamboni,mozilla/addons-server,aviarypl/mozilla-l10n-addons-server,mstriemer/zamboni,Jobava/zamboni,SuriyaaKudoIsc/olympia,Hitechverma/zamboni,Witia1/olympia,kumar303/zamboni,eviljeff/olympia,tsl143/addons-server,anaran/olympia,harry-7/addons-server,Nolski/olympia,aviarypl/mozilla-l10n-addons-server,atiqueahmedziad/addons-server,yfdyh000/olympia,diox/olympia,kumar303/olympia,koehlermichael/olympia,muffinresearch/olympia,kmaglione/olympia,robhudson/zamboni,mozilla/olympia,mudithkr/zamboni,ayushagrawal288/zamboni,jasonthomas/zamboni,aviarypl/mozilla-l10n-addons-server,muffinresearch/addons-server,beni55/olympia,mstriemer/addons-server,mdaif/olympia,elysium001/zamboni,andymckay/addons-server,johancz/olympia,johancz/olympia,tsl143/zamboni,eviljeff/zamboni,mstriemer/addons-server,wagnerand/olympia,ingenioustechie/zamboni,tsl143/zamboni,kumar303/zamboni,Joergen/olympia,kumar303/olympia,Revanth47/addons-server,lavish205/olympia,Nolski/olympia,mdaif/olympia,harry-7/addons-server,andymckay/olympia,atiqueahmedziad/addons-server,Prashant-Surya/addons-server,diox/olympia,muffinresearch/olympia,SuriyaaKudoIsc/olympia,spasovski/zamboni,wagnerand/olympia,tsl143/addons-server,Jobava/zamboni,diox/zamboni,magopian/olympia,aviarypl/mozilla-l10n-addons-server,crdoconnor/olympia,jamesthechamp/zamboni,lavish205/olympia,mrrrgn/olympia,mrrrgn/olympia,mstriemer/addons-server,tsl143/zamboni,muffinresearch/olympia,muffinresearch/addons-server,wagnerand/zamboni,anaran/olympia,Revanth47/addons-server,kumar303/addons-server,jpetto/olympia,ms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