[fixed] a11y: setting tabIndex="-1" for the dismiss button of Alerts since aria-hidden="true"
[fixed] a11y: setting tabIndex="-1" for the dismiss button of Alerts since aria-hidden="true"

apkiernan/react-bootstrap,HPate-Riptide/react-bootstrap,glenjamin/react-bootstrap,react-bootstrap/react-bootstrap,Sipree/react-bootstrap,Terminux/react-bootstrap,Lucifier129/react-bootstrap,react-bootstrap/react-bootstrap,egauci/react-bootstrap,glenjamin/react-bootstrap,react-bootstrap/react-bootstrap,Lucifier129/react-bootstrap,mmarcant/react-bootstrap,dozoisch/react-bootstrap