1.2alpha1

1. Added support for read and write operations for specific file types (ini, csv, json, yaml).
2. To enhance applicability, indirectly referenced the Content.contains method in the File class.
3. Adjusted the implementation of multiple indirectly referenced methods in the File class.
4. Added the Path.__len__ method to quickly get the length of the path string.
5. Exposed the Content.md5 method for use.
6. To enhance applicability, added two deprecated methods in the File class: create and creates.

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1. 增加了对特定文件类型（ini, csv, json, yaml）的读写操作支持。
2. 为了提高适用性，在 File 类中间接引用了 Content.contains 方法。
3. 调整了 File 类中的多个间接引用方法的实现。
4. 新增了 Path.__len__ 方法，以便快速获取路径字符串的长度。
5. 暴露了 Content.md5 方法以供使用。
6. 为了提高适用性，在 File 类中增加了两个标记为弃用的方法： create 和 creates。

What's Changed

• 1.2alpha1 by @2018-11-27 in #19

Full Changelog: 1.1.5...1.2alpha1