[AIRFLOW-1957] Add contributor to BalanceHero in Readme
[AIRFLOW-1957] Add contributor to BalanceHero in Readme

Closes #2907 from r39132/master

wndhydrnt/airflow,Acehaidrey/incubator-airflow,mtagle/airflow,zack3241/incubator-airflow,apache/airflow,edgarRd/incubator-airflow,sid88in/incubator-airflow,dhuang/incubator-airflow,KL-WLCR/incubator-airflow,wndhydrnt/airflow,zack3241/incubator-airflow,bolkedebruin/airflow,mistercrunch/airflow,sekikn/incubator-airflow,wileeam/airflow,Tagar/incubator-airflow,akosel/incubator-airflow,jgao54/airflow,mrkm4ntr/incubator-airflow,criccomini/airflow,apache/airflow,adamhaney/airflow,CloverHealth/airflow,wolfier/incubator-airflow,bolkedebruin/airflow,owlabs/incubator-airflow,DinoCow/airflow,lxneng/incubator-airflow,airbnb/airflow,Tagar/incubator-airflow,sid88in/incubator-airflow,cfei18/incubator-airflow,artwr/airflow,mrkm4ntr/incubator-airflow,apache/airflow,mrkm4ntr/incubator-airflow,Fokko/incubator-airflow,fenglu-g/incubator-airflow,malmiron/incubator-airflow,edgarRd/incubator-airflow,andyxhadji/incubator-airflow,Acehaidrey/incubator-airflow,DinoCow/airflow,criccomini/airflow,jgao54/airflow,sergiohgz/incubator-airflow,adamhaney/airflow,Fokko/incubator-airflow,nathanielvarona/airflow,danielvdende/incubator-airflow,wileeam/airflow,lyft/incubator-airflow,jgao54/airflow,danielvdende/incubator-airflow,cfei18/incubator-airflow,Acehaidrey/incubator-airflow,KL-WLCR/incubator-airflow,andyxhadji/incubator-airflow,wooga/airflow,lyft/incubator-airflow,CloverHealth/airflow,danielvdende/incubator-airflow,malmiron/incubator-airflow,nathanielvarona/airflow,yati-sagade/incubator-airflow,spektom/incubator-airflow,subodhchhabra/airflow,Fokko/incubator-airflow,edgarRd/incubator-airflow,adamhaney/airflow,KL-WLCR/incubator-airflow,apache/incubator-airflow,spektom/incubator-airflow,RealImpactAnalytics/airflow,andyxhadji/incubator-airflow,subodhchhabra/airflow,gtoonstra/airflow,Fokko/incubator-airflow,RealImpactAnalytics/airflow,nathanielvarona/airflow,airbnb/airflow,bolkedebruin/airflow,malmiron/incubator-airflow,wileeam/airflow,sekikn/incubator-airflow,danielvdende/incubator-airflow,spektom/incubator-airflow,andyxhadji/incubator-airflow,fenglu-g/incubator-airflow,lxneng/incubator-airflow,wndhydrnt/airflow,RealImpactAnalytics/airflow,mistercrunch/airflow,yk5/incubator-airflow,criccomini/airflow,r39132/airflow,fenglu-g/incubator-airflow,apache/airflow,bolkedebruin/airflow,zack3241/incubator-airflow,yati-sagade/incubator-airflow,apache/airflow,yk5/incubator-airflow,wooga/airflow,mrkm4ntr/incubator-airflow,CloverHealth/airflow,bolkedebruin/airflow,DinoCow/airflow,wileeam/airflow,lyft/incubator-airflow,jgao54/airflow,artwr/airflow,artwr/airflow,yk5/incubator-airflow,airbnb/airflow,wooga/airflow,sergiohgz/incubator-airflow,wndhydrnt/airflow,cfei18/incubator-airflow,sid88in/incubator-airflow,wolfier/incubator-airflow,cfei18/incubator-airflow,airbnb/airflow,criccomini/airflow,wooga/airflow,gtoonstra/airflow,spektom/incubator-airflow,r39132/airflow,mtagle/airflow,subodhchhabra/airflow,nathanielvarona/airflow,lxneng/incubator-airflow,cfei18/incubator-airflow,sergiohgz/incubator-airflow,dhuang/incubator-airflow,subodhchhabra/airflow,wolfier/incubator-airflow,Acehaidrey/incubator-airflow,zack3241/incubator-airflow,apache/incubator-airflow,Acehaidrey/incubator-airflow,dhuang/incubator-airflow,akosel/incubator-airflow,owlabs/incubator-airflow,wolfier/incubator-airflow,artwr/airflow,yk5/incubator-airflow,nathanielvarona/airflow,yati-sagade/incubator-airflow,Acehaidrey/incubator-airflow,lyft/incubator-airflow,CloverHealth/airflow,lxneng/incubator-airflow,edgarRd/incubator-airflow,nathanielvarona/airflow,gtoonstra/airflow,apache/incubator-airflow,RealImpactAnalytics/airflow,sergiohgz/incubator-airflow,cfei18/incubator-airflow,yati-sagade/incubator-airflow,danielvdende/incubator-airflow,mtagle/airflow,sekikn/incubator-airflow,r39132/airflow,owlabs/incubator-airflow,apache/airflow,KL-WLCR/incubator-airflow,danielvdende/incubator-airflow,owlabs/incubator-airflow,mistercrunch/airflow,dhuang/incubator-airflow,fenglu-g/incubator-airflow,DinoCow/airflow,adamhaney/airflow,apache/incubator-airflow,gtoonstra/airflow,sekikn/incubator-airflow,mtagle/airflow,Tagar/incubator-airflow,mistercrunch/airflow,akosel/incubator-airflow,Tagar/incubator-airflow,malmiron/incubator-airflow,akosel/incubator-airflow,sid88in/incubator-airflow,r39132/airflow