Releases for darwin/arm64 architecture

[jwair]

Please add support for darwin/arm64

Error from installer

$ curl -sfL https://raw.githubusercontent.com/Songmu/gotesplit/main/install.sh | sh -s -- -d
Songmu/gotesplit info checking GitHub for latest tag
Songmu/gotesplit debug http_download https://github.com/Songmu/gotesplit/releases/latest
Songmu/gotesplit info found version: v0.1.2 for v0.1.2/darwin/arm64
Songmu/gotesplit debug downloading files into /var/folders/bw/4mhn801x0nbc_c46w2_45w9w0000gq/T/tmp.gfYVNWpm
Songmu/gotesplit debug http_download https://github.com/Songmu/gotesplit/releases/download/v0.1.2/gotesplit_v0.1.2_darwin_arm64.zip
Songmu/gotesplit debug http_download_curl received HTTP status 404

[Songmu]

Thanks for the feedback. I actually use M1 Pro, so I will have to respond.

[Songmu]

Build for arm64 mac released with v0.2.0. Please check it out.