优化

• Picker: 每项属性 text 支持传入 HTML 内容，#233 Thanks @NikolaLohinski
• ActionSheet: 支持 cancelTxt 属性，配置取消文案

Improvements

• Picker: the property text of each option support passing HTML content. #233 Thanks @NikolaLohinski
• ActionSheet: support property cancelTxt to configure cancel text.