Fix broken "Build status" badge
Fix broken "Build status" badge

The build was fine, but the badge was pointing to an outdated appveyor
build

stevenhillcox/voting-application,stevenhillcox/voting-application,tpkelly/voting-application,JDawes-ScottLogic/voting-application,stevenhillcox/voting-application,JDawes-ScottLogic/voting-application,Generic-Voting-Application/voting-application,Generic-Voting-Application/voting-application,tpkelly/voting-application,Generic-Voting-Application/voting-application,tpkelly/voting-application,JDawes-ScottLogic/voting-application