Re: [BuildStream] Updated CONTRIBUTING.rst guide

[Tristan Van Berkom <tristan vanberkom codethink co uk>]

Hi again again.

On Mon, 2018-10-08 at 18:13 +0900, Tristan Van Berkom via BuildStream-
list wrote:
> Hi again,
[...]
> [...]
>
> Minor update since this was updated on Saturday.
>
> In case you have already read through this, asides from some
> grammatical errors and typo fixes, I have since added two new entries
> to the coding guidelines:
>
>   * File naming convention
>
>   * Minimize API surfaces

Updated PEP-8 coding style section one more time to add a clarification
about the linter settings for allowing 120 character length lines.

This setting exists to handle exceptionally long lines without forcing
us to write sometimes unreadable code in order to work around a strict
linter. It is not an invitation to write code, comments, or docstrings
which fill up the 120 character limit as much as possible.

Cheers,
    -Tristan