fix fundamental stac api

Author: philvarner

README.md

@@ -6,17 +6,17 @@
   - **STAC API - Features** binding: <https://api.stacspec.org/v1.0.0-rc.1/ogcapi-features#sort>
 - **Extension [Maturity Classification](https://github.com/radiantearth/stac-api-spec/README.md#maturity-classification):** Candidate
 - **Dependencies:**
-  - [STAC API - Item Search](https://github.com/radiantearth/stac-api-spec/item-search)
-  - [STAC API - Features](https://github.com/radiantearth/stac-api-spec/ogcapi-features)
+  - [STAC API - Item Search](https://github.com/radiantearth/stac-api-spec/tree/v1.0.0-rc.1/item-search)
+  - [STAC API - Features](https://github.com/radiantearth/stac-api-spec/tree/v1.0.0-rc.1/item-search)
 
 This defines a new parameter, `sortby`, that allows the user to define fields by which to sort results. 
 Only string, numeric, and datetime attributes of Item (`id` and `collection` only) or Item Properties (any attributes) 
 may be used to sort results.  It is not required that implementations support sorting over all attributes, but 
 implementations should return an error when attempting to sort over a field that does not support sorting. 
 
 This fragment may be bound to either or both of 
-[STAC API - Item Search](https://github.com/radiantearth/stac-api-spec/item-search) (`/search` endpoint) or
-[STAC API - Features](https://github.com/radiantearth/stac-api-spec/ogcapi-features) (`/collections/{collectionId}/items` endpoint) by
+[STAC API - Item Search](https://github.com/radiantearth/stac-api-spec/tree/v1.0.0-rc.1/item-search) (`/search` endpoint) or
+[STAC API - Features](https://github.com/radiantearth/stac-api-spec/tree/v1.0.0-rc.1/ogcapi-features) (`/collections/{collectionId}/items` endpoint) by
 advertising the relevant conformance class. 
 
 Fields may be sorted in ascending or descending order.  The syntax between GET requests and POST requests with a JSON