docs: func (c *EC2Metadata) Region() (string, error) {
  	resp, err := c.GetMetadata("placement/availability-zone")
  	if err != nil {
  		return "", err
  	}
  
  	if len(resp) == 0 {
  		return "", awserr.New("EC2MetadataError", "invalid Region response", nil)
  	}
  
  	// returns region without the suffix. Eg: us-west-2a becomes us-west-2
  	return resp[:len(resp)-1], nil
  }