Update CHANGES

Fixed wrong command

Author: hipertracker

CHANGES

@@ -26,13 +26,13 @@ To create a fixture:
 
 .. code-block:: bash
 
-  piccolo fixture dump --apps=blog > fixture.json
+  piccolo fixtures dump --apps=blog > fixture.json
 
 To load a fixture:
 
 .. code-block:: bash
 
-  piccolo fixture load fixture.json
+  piccolo fixtures load fixture.json
 
 As part of this change, Piccolo's Pydantic support was brought into this
 library (prior to this it only existed within the ``piccolo_api`` library). At