Configuration error: Unrecognized provider 'cloudflare'

Hello,

I noticed this error recently.

```
Serverless: Configuration error: Unrecognized provider 'cloudflare'
Serverless: You're relying on provider plugin which doesn't provide a validation schema for its config.
Serverless: Please report the issue at its bug tracker linking: https://www.serverless.com/framework/docs/providers/aws/guide/plugins#extending-validation-schema
Serverless: You may turn off this message with `configValidationMode: off` setting
Serverless: Packaging service...
Serverless: Excluding development dependencies...
Serverless: Starting Serverless Cloudflare-Worker deployment.
Serverless: Starting deployment
```

It does seem to deploy ok but I never noticed this before. I was wondering if anyone else has encountered this?

At the time of this writing it seems like the another user noticed a similar issue with the google plugin.
https://github.com/serverless/serverless-google-cloudfunctions/issues/232

Thanks!