Function check

check(): Promise<string>
Check for a valid API token.

Will prompt to add one to ~/.reuters-graphics/rngs-io.json if token is invalid or not found.

You can also set a RNGS_IO_API_TOKEN environment variable with your token, which is useful in GitHub Actions and other serverless environments.

CLI
```
Usage
  $ rngs-io token check [options]

Options
  -h, --help    Displays this message
```
Returns Promise<string>

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