Merge pull request prebid#276 from nextmillenniummedia/PB-870-bug/PBS…

…-impression-release-tag

added release tag to imppression pixel

exchange/exchange.go

@@ -26,6 +26,7 @@ import (
 	"github.com/prebid/prebid-server/stored_requests"
 	"github.com/prebid/prebid-server/usersync"
 	"github.com/prebid/prebid-server/util/maputil"
+	"github.com/prebid/prebid-server/version"
 
 	"github.com/buger/jsonparser"
 	"github.com/gofrs/uuid"
@@ -1097,7 +1098,8 @@ func (e *exchange) makeBid(
 			iframeSrc := impressionURLReplacer.Replace(e.nextmillmediaImpressionUrl)
 			iframeSrc += "&unit_id=" + strconv.Itoa(dataForStatistic.UnitID) + "&oxWinningBid=${AUCTION_PRICE:OXCRYPT}" +
 				"&browser_name=" + targetings.BrowserName + "&device_type=" + targetings.DeviceType +
-				"&refresh=" + strconv.Itoa(targetings.RefreshCount) + "&country_name=" + targetings.Geo.Country
+				"&refresh=" + strconv.Itoa(targetings.RefreshCount) + "&country_name=" + targetings.Geo.Country +
+				"&release_tag=" + version.Ver
 
 			if adapterName != "nmbid" || !pixelUseNURL {
 				if bid.bidType == openrtb_ext.BidTypeVideo {