Fix link formatting in README.md

Update fork URL to new URL

Update fork link

Further fix async stuff for python3.7 compat.

Fix import error when merging.

Switch plugins away from using deprecated function event.async()

Use async_call in regular plugins for Python 3.7+ compat

Switch async() to async_call() for python3.7 compatibility.

Add some more error conditions to isbn.

Merge pull request #265 from K0HAX/isbndb

fix youtube.py

Fix new food data.

Added burrito command, made food commands use JSON

Added, formatted and sorted Harry Potter rekts.

Merge branch 'pull-279'