Fix README

README.md

@@ -11,8 +11,7 @@ Create a virtualenv, run the script against fixtures:
 ```bash
 mkvirtualenv validata
 pip install -e .
-python validate.py --schema /path/to/schema.json table.csv
-python validate.py --schema /path/to/schema.json --checks /path/to/goodtables-checks.json table.csv
+validata --schema /path/to/schema.json table.csv
 ```
 
 ## Testing