aria2 1.8.3 released

aria2 is a lightweight multi-protocol & multi-source, cross
platform download utility operated in command-line. It supports
HTTP/HTTPS, FTP, BitTorrent and Metalink.

This release fixes the bug that --file-allocation=falloc doesn't work
with single file download. It also fixes the bug that the return value
of aria2 is unreliable if error occurs before download begins. When
custom request headers specified by --header option now override
built-in headers if they have same name.