Retract v1.0.3

[SuperQ]

• Retract the broken v1.0.3 tag.
• Bump the Go version to support retract directive.

[SuperQ]

Note, the go directive change is required for supporting the retract directive. It is also advisory for Go versions before 1.21.

[matttproud]

OK. It's pushing the version as little as required? I think that's OK. Let me ruminate on this a little and then get back to you soon.

[SuperQ]

Yes, updating the Go minimum compatibility directive is required as the retract does not work before Go 1.16.

The retract directive was added in Go 1.16. Go 1.15 and lower will report an error if a retract directive is written in the main module’s go.mod file and will ignore retract directives in go.mod files of dependencies.

Updating minimum Go version directives is a perfectly fine and normal to do.