Missing maxAttempts attributes on Verify Struct

[anggapur]

Hi,

On message bird documentation about OTP Request it mention about maxAttempts attibutes to set the maximum number of token input attempts a user can do before the Verify object is marked as failed.

But it doesn't provided on the lib.

go-rest-api/verify/verify.go

Lines 27 to 39 in e0a41ed

	type Params struct {
	Originator string
	Reference string
	Type string
	Template string
	DataCoding string
	ReportURL string
	Voice string
	Language string
	Timeout int
	TokenLength int
	Subject string
	}

[OlfaKaroui]

I noticed the same issue and I created a PR attempting to address it #131