Update definitions.json

Author: mmyyrroonn

specification/apimanagement/resource-manager/Microsoft.ApiManagement/preview/2018-06-01-preview/definitions.json

@@ -1,7 +1,6 @@
 {
   "swagger": "2.0",
   "info": {
-    "version": "1.0",
     "title": "Definitions file",
     "version": "2018-06-01-preview"
   },