Let me know switch default Ruby to 2.7

[Matthias Fechner]

Am 05.02.2020 um 01:50 schrieb Koichiro Iwao:
> please let me know before switching defautl Ruby to 2.7.
> I'm working on some issue on Ruby 2.7 with Yasuhiro KIMURA. After I
> finished it, default Ruby can be switched.

let me know if 2.7 is stable, then I can test it with gitlab if it could
be used.

Gruß
Matthias

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"Programming today is a race between software engineers striving to
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