Support for Ruby2.7?

[utkarsh2102]

Hi,

Thanks for your amazing work on mecab.
Ruby2.7 was recently released in December 2019. mecab doesn't yet have that support for 2.7 and it fails to build against Ruby2.7.

Here are the logs: https://bugs.debian.org/cgi-bin/bugreport.cgi?att=1;bug=951349;filename=mecab_0.996-9_amd64-2020-02-14T22%3A49%3A53Z.build;msg=5

And here's the Debian bug report against mecab: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=951349

It'd be great if you could look at it and extend support to Ruby2.7 as well.