Get error `module 'collections' has no attribute 'Iterable'` on Python 3.10

[sinewalker]

When calling to minecraft.postToChat() the interpreter complains that there is no Iterable attribute of the collections class.

The stack trace points to tests in util.py and vec3.py from the mcpi library.

This appears to be because of changes in the Python library at Python 3.3

https://docs.python.org/3/library/collections.abc.html

[Javac-Mike]

Fixed :)