(Breaking) Wrap weight and priority in an options object

[dmurvihill]

Consider merging this next time you choose to publish breaking changes. It wraps the weight and priority options into a single object, preserving the same default values as before.

Users who do not pass the weight or priority arguments should be unaffected.

[DirtyHairy]

After thinking about it, I'd rather overload the affected methods to allow both signatures and annotate the old signature as deprecated. This could be released immediately, and we can remove the old signature in a 0.6.0 (or maybe even 1.0.0, I think eight years are long enough for a major release 😏 ).