Relax E127 with dictionary values: allow extra indent

[blueyed]

Currently pycodestyle will complain about the following:

mydict = {12345:
              'foo'}

t-61.py:2:15: E127 continuation line over-indented for visual indent

We are about to change this in Vimjas/vim-python-pep8-indent#61, and there has been some discussion in python/peps#113 - resulting in keeping this out of PEP8 itself (i.e. undefined).

I think pycodestyle should handle this in a relaxed way, and allow for an extra indentation level for dictionary values (after : on the previous line).

[sigmavirus24]

I'm not convinced this will make people happy. As was pointed out in the peps repo, this seems to be a fringe issue. It's not apparent that the added complexity of allowing for this will result in a happier group of users. In fact, allowing this may seem more like a regression than not to some. I'd be happy to review a PR that makes this less strict here without regressing the rest of the check.