Track changes

src/RestApi/Version4/changelog.md

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+# REST API v4 Changelog
+
+## Changes
+
+- All endpoints - Rewritten with namespaces as standalone classes.
+- Coupons - Added `search` parameter.
+- Orders - Added order number to schema.
+- Product Reviews - Updated response links.
+- Products - Added `low_in_stock` and `search` parameter.
+
+## New endpoints
+
+- Added `reports/products` endpoint.
+
+## Removed endpoints
+
+- Removed `reports/top_sellers` endpoint.
+- Removed `reports/sales` endpoint.