removing unsupported ds_rename function from README

Author: swenseng-domo

README.md

@@ -110,7 +110,6 @@ The functions in this package match most parts of the API documented at [develop
 	* **ds_list** - downloads a list of data sets in your Domo instance
 	* **ds_delete** - deletes a data set (be careful)
 	* **ds_query** - allows you to send a query to a data set, Domo will evaluate that query and sends the results back as a list or a tibble
-	* **ds_rename** - renames an existing data set
 * **Groups** - This set of functions modifies and creates groups.
 	* **groups_add_users** - adds users to an existing group
 	* **groups_create** - create a group
@@ -135,4 +134,4 @@ The functions in this package match most parts of the API documented at [develop
 	* **users_update** - update a user
 	* **users_list** - list all users
 	* **users_get** - get a single user record
-	* **users_add** - create a user (or users)
+	* **users_add** - create a user (or users)