Source json.h non-locally.

Change-Id: Ia42c41fde74596b394a1f7ae0021f1a5510991a8
diff --git a/json-schema.h b/json-schema.h
index d5751c6..02e45c6 100644
--- a/json-schema.h
+++ b/json-schema.h
@@ -1,7 +1,7 @@
 #ifndef JSON_SCHEMA_H
 #define JSON_SCHEMA_H
 
-#include "json.h"
+#include <json.h>
 
 #define JSON_SCHEMA_VERSION "https://json-schema.org/draft/2020-12/schema"
 #define JSON_ERROR_MSG_MAX_LEN 512