V0.4.1: Remove unused variables & format output

Removed some unused variable and added an additional spinner animation to the transfer speed progress bar.

V0.4.0: Added concurent chapter download functionality

The chapter downloader function has been modifed to enable nested concurency where it is now able to run multiple threads that download different chapters which all spawn their own threads for concurent download of pages.

V0.3.0: Added Multi-Threading to chapter download task

The chapter downloader is now able to use multi-threading for a way faster downloading performance.

V0.2.1: Add setup tools

Configure setup tools with the necessary files.

V0.2.0: Add alternative image extension support

Add:

Images can now be saved either using 'jpg' or 'png' format using the --images-format argument.