fix readme
fix readme

romanmandryk/angular-bootstrap-nav-tree,wesleyliu/angular-bootstrap-nav-tree,b-pos465/angular-bootstrap-nav-tree,kzganesan/angular-bootstrap-nav-tree,nickperkinslondon/angular-bootstrap-nav-tree,caffeinetiger/angular-bootstrap-nav-tree,wesleyliu/angular-bootstrap-nav-tree,nickperkinslondon/angular-bootstrap-nav-tree,kzganesan/angular-bootstrap-nav-tree,SiteRadar/angular-bootstrap-nav-tree,caffeinetiger/angular-bootstrap-nav-tree,SiteRadar/angular-bootstrap-nav-tree,Repalogic/angular-bootstrap-nav-tree,romanmandryk/angular-bootstrap-nav-tree,Repalogic/angular-bootstrap-nav-tree,b-pos465/angular-bootstrap-nav-tree