Remove needless print statement

Downgrade Python dependency to >=3.7

Fix a typo in main.py for idRange.

Removed some unnecessary debug print statements.

The wrapper is now fully asynchronous. This is a breaking change, and so updating to this version without changing code first will result in errors. Using get_joke() and submit_joke will now require await statements before them.

Fix default lang code and safe-mode

Support safe-mode URL parameter for receiving jokes, and dry-run URL parameter for submitting jokes.

Adds the submit endpoint functionality.