[improvement] optimize single line ellipsis (#334)

* fix: Tabbar icon line-height

* [new feature] progress add showPivot prop

* [new feature] TabItem support vue-router

* [new feature] update document header style

* [Doc] add toast english ducoment

* [bugfix] Search box-sizing wrong

* [Doc] update vant-demo respo

* [Doc] translate theme & demo pages

* [Doc] add Internationalization document

* [bugfix] remove unnecessary props

* [fix] optimize clickoutside

* [new feature] optimize find-parent

* [new feature]: change document title accordinng to language

* [new feature] Pagination code review

* [improvement] adjust icon-font unicode

* [improvement] Icon spinner color inherit

* [improvement] icon default width

* [bugfix] DateTimePicker validate date props

* [bugfix] Tab item text ellipsis

* [improvement] optimize single line ellipsis

packages/vant-css/src/coupon-list.css

@@ -157,7 +157,8 @@
         margin: 0;
         font-size: 14px;
         font-weight: 300;
-        @mixin multi-ellipsis 1;
+        max-width: 90px;
+        @mixin ellipsis;
       }
     }
 
@@ -191,7 +192,7 @@
       h2,
       span {
         line-height: 1.4;
-        @mixin multi-ellipsis 1;
+        @mixin ellipsis;
       }
     }