New in snapd 2.60:

• Support for dynamic snapshot data exclusions
• Apparmor userspace is vendored inside the snapd snap
• Added a default-configure hook that exposes gadget default configuration
  options to snaps during first install before services are started
• Allow install from initrd to speed up the initial installation for
  systems that do not have a install-device hook
• New snap sign --chain flag that appends the account and account-key
  assertions
• Support validation-sets in the model assertion
• Support new "min-size" field in gadget.yaml
• New interface: "userns"
• Moved to go-1.18 for building which results in up to 20% smaller binaries