Remove unnecessary variables, change confusing prop name

Author: cassidoo

lessons/07-compound-components/exercise/DateFields.final.js

@@ -7,8 +7,6 @@ const DateFieldsContext = createContext()
 export default function DateFields({
   children,
   defaultValue,
-  start,
-  end,
   value: controlledValue,
   onChange
 }) {

lessons/07-compound-components/exercise/README.md

@@ -26,7 +26,7 @@ Your task is to use context to give rendering control back to the consumer. So i
   value={...}
   start={...}
   end={...}
-  onSelect={...}
+  onChange={...}
 />
 ```