Merge branch '2.x' into dev

types/index.d.ts

@@ -37,6 +37,7 @@ export class AddressList extends VanComponent {}
 export class Badge extends VanComponent {}
 export class Button extends VanComponent {}
 export class Card extends VanComponent {}
+export class Cascader extends VanComponent {}
 export class Cell extends VanComponent {}
 export class CellGroup extends VanComponent {}
 export class Circle extends VanComponent {}