Release 6.0.0

[danschultzer]

Here's the current full diff: 5fb426a...master

New methods:
contour.points
matrix.moments
matrix.mean
matrix.subtract

Breaking changes: #405 #444

This will resolve #386 #392

I'll check all issues and PR, and prioritize the ones that should make it to 6.0.0.

[peterbraden]

I added #428 and #444, let me know if there's any objections or I can probably do the release today

[danschultzer]

👍 Actually I've been working on adding in code coverage today, but lcov was causing a lot of trouble. Finally got it sorted out: #445

[danschultzer]

Let's continue this in #446 where we have the full CHANGELOG.