Update cargo-hack and remove optional-dep work around #109
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What
Update cargo-hack and remove optional-dep work around.
Why
A fix for the optional dependency issue (taiki-e/cargo-hack#153) was released in cargo-hack 0.5.15. It is no longer necessary to explicitly ask for optional dependencies to be included so that first-class features that happen to have the same name get included in the powerset. They are included in the powerset by default.
Known limitations
[TODO or N/A]