Type error in Promise catch methods as unknown

[DavidANeil]

[DavidANeil]

I chose to not add it to the recommended list, because this one really makes the most sense when combined with the useUnknownInCatchVariables flag.

Since this repo doesn't have a license: I grant you permission to use this code with or without my name and git metadata attached to it.

[mattpocock]

Thank you for this fine PR! Apologies it took so long to merge.