fix bug https://github.com/AriaLyy/Aria/issues/422

https://github.com/AriaLyy/Aria/issues/420
https://github.com/AriaLyy/Aria/issues/416
https://github.com/AriaLyy/Aria/issues/419

新增组合任务url重复检查 https://github.com/AriaLyy/Aria/issues/395

初始化任务时，如果url、path有错误将会回调`@Download.onTaskFail`、`@Upload.onTaskFail`、`@DownGroup.onTaskFail`

readme

合并代码

merge v_3.0

3.1.5

Merge branch 'v_3.0'

Merge branch 'v_3.0'