Fix ad verification lookup in xml wrapper

vast.go

@@ -185,7 +185,7 @@ type Wrapper struct {
 	// which list the resources and metadata required to execute third-party measurement code in order to verify creative playback.
 	// The <AdVerifications> element is used to contain one or more <Verification> elements,
 	// which are used to initiate a controlled container where code can be executed for collecting data to verify ad playback details.
-	AdVerifications *[]Verification `xml:",omitempty" json:",omitempty"`
+	AdVerifications *[]Verification `xml:"AdVerifications>Verification,omitempty" json:",omitempty"`
 
 	FallbackOnNoAd           *bool `xml:"fallbackOnNoAd,attr,omitempty" json:",omitempty"`
 	AllowMultipleAds         *bool `xml:"allowMultipleAds,attr,omitempty" json:",omitempty"`