fix(asset-buyer): update SRA order provider to include DAI

packages/asset-buyer/CHANGELOG.json

@@ -1,4 +1,12 @@
 [
+    {
+        "version": "3.0.3",
+        "changes": [
+            {
+                "note": "Update SRA order provider to include Dai"
+            }
+        ]
+    },
     {
         "timestamp": 1543401373,
         "version": "3.0.2",

packages/asset-buyer/src/order_providers/standard_relayer_api_order_provider.ts

@@ -100,6 +100,12 @@ export class StandardRelayerAPIOrderProvider implements OrderProvider {
         } catch (err) {
             throw new Error(AssetBuyerError.StandardRelayerApiError);
         }
-        return _.map(response.records, item => item.assetDataB.assetData);
+        return _.map(response.records, item => {
+            if (item.assetDataA.assetData === takerAssetData) {
+                return item.assetDataB.assetData;
+            } else {
+                return item.assetDataA.assetData;
+            }
+        });
     }
 }