feat(GoodsActionButton): add color prop (#4255)

src/button/README.md

@@ -97,7 +97,7 @@ Vue.use(Button);
 | type | Can be set to `primary` `info` `warning` `danger` | `string` | `default` |
 | size | Can be set to `large` `small` `mini` | `string` | `normal` |
 | text | Text | `string` | - |
-| color | Color | `string` | - |
+| color | Color, support linear-gradient | `string` | - |
 | icon | Left Icon | `string` | - |
 | tag | HTML Tag | `string` | `button` |
 | native-type | Native Type Attribute | `string` | `''` |

src/button/README.zh-CN.md

@@ -117,7 +117,7 @@ Vue.use(Button);
 | type | 类型，可选值为 `primary` `info` `warning` `danger` | `string` | `default` | 1.6.6 |
 | size | 尺寸，可选值为 `large` `small` `mini` | `string` | `normal` | - |
 | text | 按钮文字 | `string` | - | - |
-| color | 按钮颜色 | `string` | - | 2.1.3 |
+| color | 按钮颜色，支持传入`linear-gradient`渐变色 | `string` | - | 2.1.3 |
 | icon | 左侧图标名称或图片链接，可选值见 Icon 组件 | `string` | - | 2.0.0 |
 | tag | HTML 标签 | `string` | `button` | - |
 | native-type | 原生 button 标签 type 属性 | `string` | - | - |