Prepare for v2

[oschwald]

• Put main() before usage()
• Support glob for -db parameter
• Eliminate unnecessary any uses
• Run golines on code
• Don't export functions unnecessarily
• Switch to iterator for results
• Make the default output format YAML
• Improve network/IP parsing
• Do not have a public Go API
• Add a flag to include networks without data
• Do not escape for HTML again
• Add ability to output build time

[github-actions]

Modver result

This report was generated by Modver,
a Go package and command that helps you obey semantic versioning rules in your Go module.

This PR requires an increase in your module’s major version number.
If the new major version number is 2 or greater,
you must also add or update the version suffix
on the module path defined in your go.mod file.
See the Go Modules Reference for more info.

no new version of package github.com/maxmind/mmdbinspect/v2/pkg/mmdbinspect
  Major