-version output is not showing correct - shows version snapshot

[iptvcld]

# go install github.com/ncarlier/webhookd@latest
go: downloading github.com/ncarlier/webhookd v1.19.0
go: downloading golang.org/x/crypto v0.13.0
go: downloading golang.org/x/net v0.10.0
go: downloading github.com/go-fed/httpsig v1.1.0
go: downloading golang.org/x/text v0.13.0
go: downloading golang.org/x/sys v0.12.0

# which webhookd
/root/go/bin/webhookd

# webhookd -version
**Version:    snapshot**
Git commit: n/a
Built:      n/a

Copyright (C) 2020 Nicolas Carlier
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

[ncarlier]

The fix will works only for the next release.