Fixed offeringID serialized field name

Author: alexrobin

sensorhub-service-swe/src/main/java/org/sensorhub/impl/service/swe/OfferingConfig.java

@@ -32,7 +32,7 @@ public abstract class OfferingConfig
 
     @Required
     @DisplayInfo(desc="Offering URI as exposed in capabilities")
-    @SerializedName(value="Offering ID", alternate={"uri"})
+    @SerializedName(value="offeringID", alternate={"uri"})
     public String offeringID;