lower-case json fields for consistency (#287)

Author: Byron

gitoxide-core/src/repository.rs

@@ -59,8 +59,8 @@ pub mod verify {
                 serde_json::to_writer_pretty(
                     out,
                     &serde_json::json!({
-                        "index-statistics" : outcome.index_statistics,
-                        "loose-object-stores" : outcome.loose_object_stores
+                        "index_statistics" : outcome.index_statistics,
+                        "loose_object-stores" : outcome.loose_object_stores
                     }),
                 )?;
             }

tests/snapshots/plumbing/repository/verify/success-format-json

@@ -1,6 +1,6 @@
 {
-  "index-statistics": [],
-  "loose-object-stores": [
+  "index_statistics": [],
+  "loose_object-stores": [
     {
       "path": "./.git/objects",
       "statistics": {