Added whitespace peeve for before attribute access

[IanLee1521]

This missing advice came up on PyCQA/pycodestyle#553.

[the-knights-who-say-ni]

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[IanLee1521]

Oops, hadn't updated my b.p.o profile. Just did!

[brettcannon]

Have you talked to any of the PEP authors about this change (I have not seen it brought up on python-dev)? You will need one of the PEP authors to okay this before we can merge it.

[Rosuav]

To be honest, though, I doubt this is a controversial recommendation. The debate (if there is any) would be more "Do we even need to say this?" rather than "Is this duff advice?".

[warsaw]

@Rosuav Yes, that's my opinion. PEP 8 isn't a legal document so it doesn't need to spell out every single detail. This just seems unnecessary. I'm going to close this PR, and if any of the other PEP authors want to debate it further, we can reopen it.