warn when attempting to run egg using an unsupported version of go

[alexflint]

Thank you for this wonderful package!

I wonder whether you are interested in this pull request that checks that the version of go being executed is 1.16. With the wrong version of go, it looks like this:

$ egg build
2023/07/22 11:32:28 eggos requires go 1.16 but found go version go1.20.5 linux/amd64

Perhaps the test in this PR is too severe. Does eggos support older version of go, such as 1.15?

[mewmew]

Hi @alexflint!

You are right in that Eggos is currently tied to Go 1.16. Support for Go 1.17 and above requires support for the custom asm calling convention introduced in Go 1.17 (see #100).

Regarding the warning message. Would it enough to do this on the go.mod level?

module github.com/icexin/eggos

go 1.16

Cheers,
Robin