Update migration.exchange API response sample JSON

Co-authored-by: David LJ <[email protected]>

Author: davidlj95

json-logs/samples/api/migration.exchange.json

@@ -9,5 +9,9 @@
   "invalid_user_ids": [
     ""
   ],
-  "user_id_map": {}
+  "user_id_map": {
+    "0": "0",
+    "1": "1",
+    "2": "2"
+  }
 }

slack-api-client/src/test/java/test_locally/sample_json_generation/MethodsResponseDumpTest.java

@@ -24,6 +24,7 @@
 
 import java.util.Arrays;
 import java.util.HashMap;
+import java.util.Map;
 
 public class MethodsResponseDumpTest {
     // This test class generates sample JSON data for the Web APIs
@@ -82,7 +83,11 @@ public void views_publish() throws Exception {
     public void migration_exchange() throws Exception {
         MigrationExchangeResponse response = new MigrationExchangeResponse();
         response.setInvalidUserIds(Arrays.asList(""));
-        response.setUserIdMap(new HashMap<>());
+        Map<String, String> userIdMap = new HashMap<>();
+        userIdMap.put("0", "0");
+        userIdMap.put("1", "1");
+        userIdMap.put("2", "2");
+        response.setUserIdMap(userIdMap);
         ObjectInitializer.initProperties(response);
         dumper.dump("migration.exchange", response);
     }