feat: Promise#rescue can now take a list of error class filters.

[arthurschreiber]

Example:

p = Promise.new
p.reject(StandardError.new("fail"))

p2 = p.rescue(RuntimeError) { |err| :fixed }
p2.rejected? #=> true
p2.reason #=> #<StandardError: fail>

p3 = p.rescue(RuntimeError, StandardError) { |err| :fixed }
p3.rejected? #=> false
p3.value #=> :fixed

[dylanahsmith]

This feels like second test of three that got grouped together in a single test.

[dylanahsmith]

Isn't the ability to specify a block or proc without all the arguments just a property of ruby? E.g.

irb> proc { :foo }.call(1)
=> :foo

It looks like this is an unnecessary test.

[dylanahsmith]

I don't think these tests for catch are necessary, since it is just an alias for rescue