Pythumb

Added
- Add support for YouTube Shorts URLs

Changed
- Update dependencies
- requests 2.25.0 -> 2.27.1

Fixed
- Fix AttributeError when output is stdout

Changes
- Add support for more thumbnail variants
- Don't raise `NotADirectoryError` from `FileExistsError` on mkdir
- Simplify exception handling and print more detailed errors in CLI
- Store image as `bytes` instead of `BytesIO`
- Disable caching of the image to allow fetching multiple sizes
- Remove unused exception arguments

Fixes
- Reduce Windows executable file size

Changes
- Add docstrings and comments
- Increase default timeout to 5 seconds
- Update help for CLI argument 'timeout'

Fixes
- Exclude python36.dll from UPX in Windows build spec

Changes
- Allow writing to stdout

Fixes
- Write to stderr instead of stdout on error

Fixes
- Fix linux binaries archive directory
- Add missing CLI entry point

Initial release