不能旋转的么？

[tao-alan]

提交ISSUE前请确保已认真阅读以下内容

Please read the following information carefully before you open an issue.

在提交issue之前必须确认以下问题：

Please make sure you understand the following points:

• 必须是一个bug或者功能新增。

• It must be a bug or a feature request

• 必须是we-cropper相关问题，原生小程序问题去开发者论坛。

• It must be a we-cropper issue.

• 已经在issue中搜索过，并且没有找到相似的issue或者解决方案。

• I searched issue already but I did't find any relevant issues or solutions.

• 完善下面模板中的信息

• Please filled out the following template

阅读完后请在提交的issue中删除以上内容，包括分割线

DELETE THE INFORMATION ABOVE(INCLUDE THE SEPARATION LINE) BEFORE YOU OPEN AN ISSUE

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Description

[问题描述：站在其它人的角度尽可能清晰地、简洁地把问题描述清楚]
[Description of the issue]

Environment

• Platform: [开发者工具/iOS/Andriod/Web]
• Platform version: [对应工具或者iOS或者Andriod的版本号]
• Wechat version: [微信版本号]
• we-cropper version: [在package.json里]
• other version: [如果是插件问题，请列出问题插件的版本号]

Reproduce

[如何重现问题]

[How to reproduce the issue]

Observed Results

[实际表现]

[Observed Results]

Expected Results

[期望表现]

[Expected Results]

Relevant Code / Logs

// TODO(you): code or logs ohere to reproduce the problem

[dlhandsome]

#50