[pypa-committers]Adding CoC link to the list description

Hi folks, It was recently pointed out to me that the distutils-sig list description is missing a CoC reference (see [1]), and it occurred to me that the description for this list should also link to the PyPA CoC: https://www.pypa.io/en/latest/code-of-conduct/ Cheers, Nick. [1] https://github.com/pypa/pypa.io/issues/33 -- Nick Coghlan | ncoghlan@gmail.com | Brisbane, Australia