真棒字体5-为什么没有显示比特币，Facebook，Twitter等图标？

Question

难道只有我一个人无法在5.0.8版中渲染比特币和Facebook图标吗？<link rel="stylesheet" type="text/css" href="https://use.fontawesome.com/releases/v5.0.8/css/fontawesome.css"><i class="fa fa-btc"></i><i class="fa fa-bitcoin"></i><i class="fa fa-facebook"></i><i class="fa fa-facebook-f"></i>