Fix argument forwarding in Ruby 2.7

[qnighy]

Fixes #148.

In Ruby 2.7 keyword arguments are not yet separated from positional ones. **kwargs was seemingly introduced here to suppress warnings, but for accuracy we need to remove **kwargs and just add ruby2_keywords.

[qnighy]

Thanks for the quick merge! A patch release would be helpful.

[mperham]

Yes, in the morning. Thank you for the patch.

…

On Tue, Apr 13, 2021 at 19:03 Masaki Hara ***@***.***> wrote: Thanks for the quick merge! A patch release would be helpful. — You are receiving this because you modified the open/close state. Reply to this email directly, view it on GitHub <#149 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AAAAWX7X6CXRO64WSX5QKGDTITZYVANCNFSM4227VVYA> .

[mperham]

Done.

[qnighy]

Thanks!