fix pricing cols

Author: maskarb

nise/generators/aws/aws_generator.py

@@ -174,7 +174,8 @@
     "pricing/RateCode",
     "pricing/RateId",
     "pricing/currency",
-    "pricing/OfferingClasspricing/PurchaseOption",
+    "pricing/OfferingClass",
+    "pricing/PurchaseOption",
     "pricing/publicOnDemandCost",
     "pricing/publicOnDemandRate",
     "pricing/term",