fix(datepicker): added role="row" in weekday header for a11y (#3361)
fix(datepicker): added role="row" in weekday header for a11y (#3361)

row="columnheader" needs a parent with a role="row"
benouat/ng-bootstrap,jnizet/ng-bootstrap,maxokorokov/core,jnizet/ng-bootstrap,benouat/ng-bootstrap,maxokorokov/core,jnizet/ng-bootstrap,ng-bootstrap/ng-bootstrap,ng-bootstrap/ng-bootstrap,benouat/ng-bootstrap,fbasso/ng-bootstrap,ng-bootstrap/ng-bootstrap,ng-bootstrap/ng-bootstrap,benouat/ng-bootstrap,fbasso/ng-bootstrap,fbasso/ng-bootstrap,jnizet/ng-bootstrap,maxokorokov/core,fbasso/ng-bootstrap,maxokorokov/core