Cannot connect to server with "-" character

[piclem]

When a server contains the "-" symbol, the parse_server_string() method in lycheeupload.py returns false and prevent the upload to perform.
Adding \- in the regular expression seems to solve this:
(.+)@([\w\d\.\-]+):(.+)
instead of
(.+)@([\w\d\.]+):(.+)

[r0x0r]

I don't really maintain this project any more. Could you make a PR and I will merge it?