wag: Breaking changes v1.4.2

You made me work hard for this update 😄

Needed to upgrade to go 1.18 from 1.17 as a module requires 1.18. This meant an upgrade from Alpine 3.15 to 3.16 to get go 1.18

Then the change in the config.json required the creation of a "Wireguard": {} stanza as per the new documented example_config.json.

A release notes file would be useful to prevent prolonged downtime when upgrading.