Update Metadata Item

Update a specific metadata item.

PUT `/blobs/metadata/:id`

Parameter	Type	Required	Description
`id`	string	Yes	The unique ID of the metadata item.

Parameter	Type	Required	Description
`value`	string	No	New value string.
`data`	object	No	New data object.

Returns an empty JSON object upon success.

{
  "value": "medium"
}