update readme to match ref-metrics

README.md

@@ -38,8 +38,8 @@ print(res)
 
 ```json
 {
-    "global": {
-        "ahoy_IR_b2_engine_3_6_0_49_gd81d3b63_oversea": {
+    "ahoy_IR_b2_engine_3_6_0_49_gd81d3b63_oversea": {
+        "overall": {
             "all": {
                 "f1": 0.15967351103175614,
                 "fn": 2923.0,
@@ -55,11 +55,9 @@ print(res)
                 "recognized_0.8": 1,
                 "tp": 626.0
             }
-        }
-    },
-    "per_sequence": {
-        "Sentry_2023_02_08_PROACT_CELADON_@6m_MOB_2023_02_08_12_51_49": {
-            "ahoy_IR_b2_engine_3_6_0_49_gd81d3b63_oversea": {
+        },
+        "per_sequence": {
+            "Sentry_2023_02_08_PROACT_CELADON_@6m_MOB_2023_02_08_12_51_49": {
                 "all": {
                     "f1": 0.15967351103175614,
                     "fn": 2923.0,
@@ -79,6 +77,7 @@ print(res)
         }
     }
 }
+
 ```
 
 ## Metric Settings