message: remove item class
diff: @@ -5,7 +5,6 @@ import styled from 'styled-components'
  import {COMMON, FLEX, get} from './constants'
  import theme from './theme'
  -const ITEM_CLASS = 'Breadcrumb-item'
  const SELECTED_CLASS = 'selected'
  function BreadcrumbBase({className, children, ...rest}) {
  @@ -30,9 +29,7 @@ const Breadcrumb = styled(BreadcrumbBase)`
  }
  `
  -Breadcrumb.Wrapper = styled.li.attrs(() => ({
  - className: classnames(ITEM_CLASS)
  -}))`
  +Breadcrumb.Wrapper = styled.li`
  display: inline-block;
  white-space: nowrap;
  list-style: none;
  