Hey! I love this uploader, and now that I've been learning Go I thought I'd give adding some functionality a shot. I'm sorry if I'm doing something wrong - I'm new to contributing. Please let me know if there's any issues and I'll handle them :)

If you do decide you'd like to merge the request you'll have to let me know how you generate the CLI usage screenshot! I couldn't figure out what tool you used to update the README.

New Features

1. Added a -dir flag that accepts a directory then uploads all files inside the directory (non-recursive... maybe later haha)
2. Using the same update, it was easy now to read multiple args instead of a single one and plug it into the directory upload code

To make the -dir flag work, the script now loops all args/directory files first and for each of those it runs the upload code and stores them in a slice for later. Once done, if there's only one file uploaded it'll print the upload URL and copy it to the clipboard, but if there's multiple files it'll print a table with the file name and the uploaded URL and store them in a log file.

I've done some small refactors where necessary, like updating deprecated function calls and moving some code to separate functions to make reading the main loop easier.

That's it I think. Code should be pretty self-explanatory but, like I said, I'm new to Go so if you have any questions or suggestions etc please let me know. This is as much a learning experience for me as it is improving a dope tool.