This release includes the following fixes and features:

- JSON and YAML serialization

Each XXXInfo struct now has a `JSONString()` and `YAMLString()` method
that returns serialized JSON or YAML. The `ghwc` client has added a new
`--format|-f` CLI option to control the output of the program.

- NICCapability.CanChange field renamed and fixed

The `ghw.NICCapability.CanChange` field has been renamed to `CanEnable`
to better describe the field's purpose. The boolean value of the field
is now properly calculated from ethtool -k output.

- GHW_DISABLE_WARNINGS

You may now disable the output of warning messages to stderr by setting
the GHW_DISABLE_WARNINGS environs variable.

- A new 'virtio' bus type was added