silence warning about line clamping

src/components/Channel.vue

@@ -197,6 +197,7 @@ export default class Channel extends Vue {
 .title {
     margin: .25em 1em;
     display: -webkit-box;
+    /*noinspection CssUnknownProperty*/
     -webkit-line-clamp: 2;
     -webkit-box-orient: vertical;
     overflow: hidden;