[Hub Generated] Review request for Microsoft.CostManagement to add version stable/2020-06-01 (Azure#11753)

* Creating separate swagger file for exports

* add exports swagger to readme

* edit api version

* add "TheLast7Days" to exports timeframes

* remove 'TheLast7Days' from export timeframes

* prettier fix

* prettier fix 2

* Fix for swagger correctness: eTag property missing and recurrence not required

Author: paornela

specification/cost-management/resource-manager/Microsoft.CostManagement/stable/2020-06-01/costmanagement.exports.json

@@ -853,10 +853,7 @@
           "description": "Has start and end date of the recurrence. The start date must be in future. If present, the end date must be greater than start date.",
           "$ref": "#/definitions/ExportRecurrencePeriod"
         }
-      },
-      "required": [
-        "recurrence"
-      ]
+      }
     },
     "ExportDeliveryInfo": {
       "description": "The delivery information associated with a export.",
@@ -1032,7 +1029,7 @@
       "type": "object",
       "allOf": [
         {
-          "$ref": "#/definitions/Resource"
+          "$ref": "#/definitions/ProxyResource"
         }
       ],
       "properties": {