Stable Version

Fix a few bugs.

Improved version

v0.1.8

Fix resolving addr infos when url contains port.

Asynchronous version

Asynchronous implementation without 3rd wheel.
There may be some flaws.

v0.1.1

Improve the robustness of network requests
Fix the function which resolves the URI file name

v0.1.0

Add download function
Add resume function