Set black line-length to 130 in tox settings

[samredai]

This adds --line-length to the black autoformatter and format checker commands in tox.ini

This may cause some open PRs to require rebasing (there's never a good time to change an auto-formatter) but alternatively we can keep this PR open and wait for a dip in open PRs to rebase this PR, run tox -e format, and commit the updates.

The first commit fcddb35 is the actual change to the formatter, the second commit 66325f4 is the result of running tox -e format on the project.

[kbendick]

LGTM

[rdblue]

What was the line length without this? Do we need to do this?

[samredai]

@rdblue the default for black is 88. From what I've seen, that's usually bumped up to somewhere in the range of 110-130. To see some of the side-effects of a low line-length setting, see this comment on another PR.

[rdblue]

88 seems a bit small to me. Since we should do this when it will introduce as few changes as possible, I'll go ahead and merge. Thanks, @samredai!

[samredai]

Thanks @rdblue. I'm going to open a quick follow-up PR to autoformat again. Looks like a PR was merged after I opened this so wasn't caught here!

[rdblue]

Thanks!

[jun-he]

Thanks @samredai