Always use struct

src/json_commit_request_parser.hpp

@@ -12,7 +12,7 @@
  * This parser uses the weaseljson library to parse JSON-formatted
  * commit requests into CommitRequest objects.
  */
-class JsonCommitRequestParser : public CommitRequestParser {
+struct JsonCommitRequestParser : CommitRequestParser {
 public:
   // Parser state
   enum class ParseState {