Promote a dev orb version to a stable semver

## Usage

`circleci orb publish promote <namespace>/<orb>@dev:<label> --bump major|minor|patch [flags]`

## Arguments

- `<namespace>/<orb>@dev:<label>` is the dev version to promote, for example, `namespace/orb-name@dev:my-branch`

## Flags

| Flag            | Description                                                |
| --------------- | ---------------------------------------------------------- |
| `--bump string` | which version segment to increment: major, minor, or patch |

Global flags: `-c, --config`, `--debug`, `--no-color`, `-q, --quiet` — see `circleci --help`.

## Examples

- Promote dev:my-branch to a patch release: 
  `circleci orb publish promote myorg/my-orb@dev:my-branch --bump patch`
- Promote to a minor release: 
  `circleci orb publish promote myorg/my-orb@dev:my-branch --bump minor`
- Promote to a major release: 
  `circleci orb publish promote myorg/my-orb@dev:my-branch --bump major`

## Details

Promote a dev orb version to a stable semver version.

The dev version ref must be in the form `<namespace>/<orb>@dev:<label>`.
The --bump flag determines how the version is incremented
from the latest stable release.

