fix json format issue (#130)

lixingwang · web-flow · commit 226f95b4cfd3 · 2020-08-12T12:30:25.000-04:00
diff --git a/function/string/descriptor.json b/function/string/descriptor.json
@@ -395,7 +395,7 @@
         {
           "name": "str",
           "type": "string"
-        },
+        }
       ],
       "return": {
         "type": "string"
