fix(toast): 新增 warning 主题类型

Author: theEfrain08

src/toast/README.en-US.md

@@ -16,7 +16,7 @@ overlay-props | Object | - | Typescript：`OverlayProps `，[Overlay API Documen
 placement | String | middle | options:  top/middle/bottom | N
 prevent-scroll-through | Boolean | false | \- | N
 show-overlay | Boolean | false | \- | N
-theme | String | - | options: loading/success/error | N
+theme | String | - | options: loading/success/warning/error | N
 using-custom-navbar | Boolean | false | \- | N
 
 ### Toast Events

src/toast/README.md

@@ -53,7 +53,7 @@ overlay-props | Object | - | 遮罩层属性，透传至 Overlay。TS 类型：`
 placement | String | middle | 弹窗展示位置。可选项： top/middle/bottom | N
 prevent-scroll-through | Boolean | false | 防止滚动穿透，即不允许点击和滚动 | N
 show-overlay | Boolean | false | 是否显示遮罩层 | N
-theme | String | - | 提示类型。可选项：loading/success/error | N
+theme | String | - | 提示类型。可选项：loading/success/warning/error | N
 using-custom-navbar | Boolean | false | 是否使用了自定义导航栏 | N
 
 ### Toast Events

src/toast/index.ts

@@ -2,7 +2,7 @@ import { getInstance } from '../common/utils';
 
 type Context = WechatMiniprogram.Page.TrivialInstance | WechatMiniprogram.Component.TrivialInstance;
 
-type ToastType = 'loading' | 'success' | 'error';
+type ToastType = 'loading' | 'success' | 'warning' | 'error';
 type ToastPositionType = 'top' | 'middle' | 'bottom';
 type ToastDirectionType = 'row' | 'column';