Fix Postman JSON Schema compatibility

Author: mittsh

src/index.ts

@@ -54,6 +54,7 @@ class PostmanGenerator implements Paw.Generator {
       name: pawGroup.name,
       item: pmChildren,
       protocolProfileBehavior: null,
+      response: [],
     }
     return pmItem
   }
@@ -101,6 +102,7 @@ class PostmanGenerator implements Paw.Generator {
       name: pawRequest.name,
       request: pmRequest,
       protocolProfileBehavior: pmOptions,
+      response: [],
     }
     return pmItem
   }

src/types-paw-api/postman.d.ts

@@ -40,6 +40,11 @@ export interface Item {
     request?: Request|null
     item?: Item[]|null
     protocolProfileBehavior: ProtocolProfileBehavior|null
+    response: Response[]
+}
+
+export interface Response {
+    // not defined
 }
 
 export interface Request {