fixed serialization problem: outputs was loaded as str

sure_tosca-flask-server/sure_tosca/swagger/swagger.yaml

@@ -734,7 +734,9 @@ definitions:
       policy_types:
         key: "policy_types"
       topology_template:
-        outputs: "outputs"
+        outputs:
+        - key: "{}"
+        - key: "{}"
         substitution_mappings:
           key: "{}"
         inputs:
@@ -818,7 +820,9 @@ definitions:
           type: "object"
           properties: {}
       outputs:
-        type: "string"
+        type: "array"
+        items:
+          type: "object"
           additionalProperties:
             type: "object"
             properties: {}