Fails under Python 3.10: AttributeError: module 'collections' has no attribute 'MutableMapping'

[GaryScottMartin]

The attribute MutableMapping was previously moved from 'collections. to 'collections.abc'. It was removed from 'collections' in 3.10.

[ZenulAbidin]

I fixed this in my fork of Pywallet: https://github.com/ZenulAbidin/zpywallet