Make manifiest legal JSON

Suggested change for issue #722
Encode header information in JSON comments. This will allow
PlatformIO to use a newer release.

Author: jmwanderer

library.json

@@ -1,11 +1,8 @@
-# =========================================================================
-#   Unity - A Test Framework for C
-#   ThrowTheSwitch.org
-#   Copyright (c) 2007-24 Mike Karlesky, Mark VanderVoord, & Greg Williams
-#   SPDX-License-Identifier: MIT
-# =========================================================================
-
 {
+  "_comment0:": "Unity - A Test Framework for C",
+  "_comment1:": "ThrowTheSwitch.org",
+  "_comment2:": "Copyright (c) 2007-24 Mike Karlesky, Mark VanderVoord, & Greg Williams",
+  "_comment3:": "SPDX-License-Identifier: MIT",
   "name": "Unity",
   "version": "2.6.0",
   "keywords": "unit-testing, testing, tdd, testing-framework",