* 0.1.8
* not use failure anymore
* 0.1.7
* update readme
* 0.1.6
* clippy fix
* 0.1.5
* async_get_object return buffer and use Cow<'a, str> avoid multi alloc
* 0.1.4
* replace string with raw buffer for the return of get_object
* 0.1.3
* replace xml-rs with quick_xml
* refactor service api, return whole ListBuckets info now
* impl get_object_acl, a example for other object resource api