Update install instructions
Update install instructions

lecterror/holidays,yoka/holidays,harvesthq/holidays,samzurcher/holidays,okdas/holidays,alexdunae/holidays,domain7/holidays,emilianodellacasa/holidays,rumblelabs/holidays,jg/holidays,george-semenov/holidays,hubbiz/holidays,hasanen/holidays,seanhandley/holidays,dceddia/holidays,mirelon/holidays,timur/holidays,ptrimble/holidays,HealthWave/holidays,netikular/holidays,johankok/holidays,ghiculescu/holidays,PerfectlyNormal/holidays,DenisKnauf/holidays,kreintjes/holidays,tallgreentree/holidays,ghiculescu/holidays,jak78/holidays,causztic/holidays,ideeli/holidays,sugi/holidays,rtcreativegroup/holidays,ptrimble/holidays,alexdunae/holidays,thomasguillory/holidays