Ability to suppress specific metadata label/annotations

[jkroepke]

Hi,

helm diff produces large diffs, if a helm chart upgrade is happening.

Since its common to put the chart version as label on each resource, Each resource has a diff at minimum.

[jkroepke]

ref #392

[MrKich]

Is it possible to suppress lines not only in diff output, but in diff logic, too (e.g. do not return exit code 2 if all changes are only in suppressed lines) ?