Authorization is broken?

sqlalchemy-clickhouse version: 0.1.5.post0 from pypi
clickhouse version: 19.13.2.19

Trying to connect:
```(venv) [user@srv1:~/venv]$ python
Python 3.6.8 (default, Apr 25 2019, 21:02:35)
[GCC 4.8.5 20150623 (Red Hat 4.8.5-36)] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import sqlalchemy
>>> engine = sqlalchemy.create_engine('clickhouse://test:pUK4Tyk4GMVvn4cG@127.0.0.1:8123/metrics')
>>> result = engine.execute("select * from test")
Traceback (most recent call last):
File "", line 1, in
File "/home/pkesso/venv/lib/python3.6/site-packages/sqlalchemy/engine/base.py", line 2178, in execute
connection = self._contextual_connect(close_with_result=True)
File "/home/pkesso/venv/lib/python3.6/site-packages/sqlalchemy/engine/base.py", line 2239, in _contextual_connect
self._wrap_pool_connect(self.pool.connect, None),
File "/home/pkesso/venv/lib/python3.6/site-packages/sqlalchemy/engine/base.py", line 2275, in _wrap_pool_connect
return fn()
File "/home/pkesso/venv/lib/python3.6/site-packages/sqlalchemy/pool/base.py", line 363, in connect
return _ConnectionFairy._checkout(self)
File "/home/pkesso/venv/lib/python3.6/site-packages/sqlalchemy/pool/base.py", line 760, in _checkout
fairy = _ConnectionRecord.checkout(pool)
File "/home/pkesso/venv/lib/python3.6/site-packages/sqlalchemy/pool/base.py", line 492, in checkout
rec = pool._do_get()
File "/home/pkesso/venv/lib/python3.6/site-packages/sqlalchemy/pool/impl.py", line 139, in _do_get
self._dec_overflow()
File "/home/pkesso/venv/lib/python3.6/site-packages/sqlalchemy/util/langhelpers.py", line 68, in __exit__
compat.reraise(exc_type, exc_value, exc_tb)
File "/home/pkesso/venv/lib/python3.6/site-packages/sqlalchemy/util/compat.py", line 153, in reraise
raise value
File "/home/pkesso/venv/lib/python3.6/site-packages/sqlalchemy/pool/impl.py", line 136, in _do_get
return self._create_connection()
File "/home/pkesso/venv/lib/python3.6/site-packages/sqlalchemy/pool/base.py", line 308, in _create_connection
return _ConnectionRecord(self)
File "/home/pkesso/venv/lib/python3.6/site-packages/sqlalchemy/pool/base.py", line 437, in __init__
self.__connect(first_connect_check=True)
File "/home/pkesso/venv/lib/python3.6/site-packages/sqlalchemy/pool/base.py", line 639, in __connect
connection = pool._invoke_creator(self)
File "/home/pkesso/venv/lib/python3.6/site-packages/sqlalchemy/engine/strategies.py", line 114, in connect
return dialect.connect(*cargs, **cparams)
File "/home/pkesso/venv/lib/python3.6/site-packages/sqlalchemy/engine/default.py", line 453, in connect
return self.dbapi.connect(*cargs, **cparams)
File "/home/pkesso/venv/lib/python3.6/site-packages/sqlalchemy_clickhouse/connector.py", line 111, in connect
return Connection(*args, **kwargs)
File "/home/pkesso/venv/lib/python3.6/site-packages/sqlalchemy_clickhouse/connector.py", line 118, in __init__
super(Connection, self).__init__(db_name, db_url, username, password, readonly)
File "/home/pkesso/venv/lib/python3.6/site-packages/infi/clickhouse_orm/database.py", line 112, in __init__
self.db_exists = self._is_existing_database()
File "/home/pkesso/venv/lib/python3.6/site-packages/infi/clickhouse_orm/database.py", line 393, in _is_existing_database
r = self._send("SELECT count() FROM system.databases WHERE name = '%s'" % self.db_name)
File "/home/pkesso/venv/lib/python3.6/site-packages/sqlalchemy_clickhouse/connector.py", line 102, in _send
raise Exception(r.text)
Exception: Code: 194, e.displayText() = DB::Exception: Password required for user default (version 19.13.2.19)
```
clickhouse log:

`2019.09.24 12:58:41.979196 [ 56 ] {} HTTPHandler: Code: 194, e.displayText() = DB::Exception: Password required for user default, Stack trace:`

As you can see, I tried to connect with 'test' user and some password, but it seems to ignore user and password. The only situation where I was able to conntect is default user with no password.