Bug fix
* "Queries" that do not return data results (like DDL and SET queries) are now automatically treated as commands. Closes https://github.com/ClickHouse/clickhouse-connect/issues/59
New Features
* A UUID session_id is now generated by default if `session_id` is not specified in `clickhouse_connect.get_client`
* Test infrastructure has been simplified and test configuration has moved from pytest options to environment files