message: style(devtools): change cursor to pointer when hovering; change bkg colour and add border radius (rangle/angular-devtools#59)
diff: }
  :host /deep/ mat-tree-node:hover {
  - background-color: #f3f3f3;
  + background-color: #d4e7ff;
  + cursor: pointer;
  }
  :host /deep/ mat-tree-node.selected, :host /deep/ mat-tree-node.highlighted {
  - background-color: #dadada;
  + background-color: #92bdff;
  }
  :host /deep/ mat-tree-node.matched {
  :host /deep/ mat-tree-node {
  transition: background-color 100ms;
  + border-radius: 8px;
  }
  .dir-names {
  