Return values for set and remove

[maciejmrozinski]

As shortly discussed here we're considering to return PromiseInterface for set and remove methods. Do You have any reasons to not agree?

[jsor]

Definitely +1

[clue]

Yeah, makes perfect sense 👍

[maciejmrozinski]

#16

[WyriHaximus]

This has been implemented through #23 based on commits from #16, thank you @maciejmrozinski 👍