Switch CI badge to match style of other badges. [skip ci]. (#3932)
Switch CI badge to match style of other badges. [skip ci]. (#3932)


smawson/istio,istio/istio,smawson/istio,geeknoid/istio,istio/istio,frankbu/istio,istio/istio,frankbu/istio,smawson/istio,geeknoid/istio,frankbu/istio,geeknoid/istio,istio/istio,istio/istio,smawson/istio,geeknoid/istio,geeknoid/istio,frankbu/istio,smawson/istio,geeknoid/istio,smawson/istio,frankbu/istio,frankbu/istio