New Zerobounce API validation

[ondracek]

According to the new Zerobounce API validation, there need to be done two changes in the lib:

gozerobounce/api.go

Line 12 in 131bea5

const URI = `https://api.zerobounce.net/v2/`

const URI = `https://api.zerobounce.net/v2`

gozerobounce/api.go

Line 94 in 131bea5

params.Set("ip_address", IPAddress)

if len(IPAddress) > 0 {
	params.Set("ip_address", IPAddress)
}