+ Course chapter folder are now placed in a folder, the name of the folder is the course id
**If you have any downloads in-progress, make a new folder and name it the course id, and move the chapter folders into it before starting the download again.**
Closes#8
+ Add ability to skip downloading lecture videos
+ You can now specify the Bearer token and course id as an argument to the program (see advanced usage)
+ Updated Advanced Usage section of readme
+ Downloader will now raise an exception for failed requests
+ Captions will retry 3 times on a download failure before skipping
+ Catch errors from downloader
+ Added arguments
+ You can specify the download quality, if the quality you request cant be found, it will fallback to the closest (ex. you want 144, but the lowest is 360 than 360 gets downloaded. you want 1080 but 720 is the highest, 720 gets downloaded)
Note: Non-DRM and DRM video have different quality availabilities, by the looks of it, DRM has a min of 360 and a max of 1080. Non-DRM has a low of 144, and a max of 720
