Update README.md

Co-authored-by: Tobias <t@tobiasjordans.de>

Author: k-yle

README.md

@@ -633,6 +633,7 @@ And may optionally be combined with one of these properties:
 - `value`: The value that the key must have.
 - `values`: The values that the key must have.
 - `valueNot`: The value that the key must not have.
+- `valuesNot`: The values that the key must not have.
 
 Alternatively, the object may contain a single property: