Reach 100% test coverage

### Prerequisites - [X] I have written a descriptive issue title - [X] I have searched existing issues to ensure the issue has not already been raised ### Issue We want to remove: https://github.com/fastify/fastify-rate-limit/blob/595a627020837d5c4ad3de7a235f385f3e6af2a5/.taprc#L3-L6