[Python-ideas] Add an UML class diagram to the collections.abc module documentation

[Yahya Abou 'Imran]

Here is another version showing all that inherit from Container, Sized and Iterable.
I got rid of ABCMeta, since it's not the prupose of the documentation of that page.
I left the parenthesis and the end of the methods names though...

[collections_abc.png]
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/python-ideas/attachments/20171230/482ac9a1/attachment-0001.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: collections_abc.png
Type: image/png
Size: 71475 bytes
Desc: not available
URL: <http://mail.python.org/pipermail/python-ideas/attachments/20171230/482ac9a1/attachment-0001.png>