Pass value in PromiseV2#always just like PromiseV1#always does it

[janbiedermann]

Makes PromiseV2 more compatible with PromiseV1

[elia]

Great catch!

I added a commit with a couple of tests that pass using PromiseV1 and are partially failing with this code, can you please look into it? I couldn't find any obvious solution 🙏

[janbiedermann]

Things i would still like to do (soon):

• mark the other private methods private
• make V2 work in c-Ruby
• make it isomorphically available in lib, not necessarily required, but would be nice
• "refactor" for codeclimate

[hmdne]

make V2 work in c-Ruby

Well... I'm afraid we would need to use V1 not V2, but both are mostly compatible (we are finding incompatibilities just now).

make it isomorphically available in lib

Creating an isomorphic core is a great idea. But - I'd say, we would want to rename it to Opal::Promise perhaps.