bidrequest: Add new fields related to seats from 2.5 Spec

Author: emaraschio

bidrequest.go

@@ -23,6 +23,8 @@ type BidRequest struct {
 	AuctionType int          `json:"at"`                // Auction type, where 1 = First Price, 2 = Second Price Plus. Exchange-specific auction types can be defined using values greater than 500.
 	TMax        int          `json:"tmax,omitempty"`    // Maximum amount of time in milliseconds to submit a bid
 	WSeat       []string     `json:"wseat,omitempty"`   // Array of buyer seats allowed to bid on this auction
+	BSeat       []string     `json:"bseat,omitempty"`   // Array of buyer seats blocked to bid on this auction
+	WLang       []string     `json:"wlang,omitempty"`   // Array of languages for creatives using ISO-639-1-alpha-2
 	AllImps     int          `json:"allimps,omitempty"` // Flag to indicate whether exchange can verify that all impressions offered represent all of the impressions available in context, Default: 0
 	Cur         []string     `json:"cur,omitempty"`     // Array of allowed currencies
 	Bcat        []string     `json:"bcat,omitempty"`    // Blocked Advertiser Categories.

testdata/breq.native.json

@@ -43,5 +43,13 @@
   },
   "user": {
     "id": "55816b39711f9b5acf3b90e313ed29e51665623f"
-  }
+  },
+  "wseat": [
+    "771",
+    "772"
+  ],
+  "bseat": [
+    "800",
+    "773"
+  ]
 }