Use mandatory args

src/client/client.py

@@ -28,7 +28,7 @@ async def main():
     args = PARSER.parse_args()
     log_format = "%(asctime)s - %(name)s - %(levelname)s - %(message)s"
     logging.basicConfig(level=args.log_level, format=log_format)
-    wc = WatersmartClient(args.url, args.email, args.password)
+    wc = WatersmartClient(url=args.url, email=args.email, password=args.password)
     try:
         data = await wc.usage()
         for datapoint in sorted(data, key=lambda x: x["read_datetime"]):

src/watersmart/__init__.py

@@ -24,7 +24,7 @@ class WatersmartClientAuthenticationError(WatersmartClientError):
 
 
 class WatersmartClient:
-    def __init__(self, url, email, password, session=None):
+    def __init__(self, *, url, email, password, session=None):
         self._url = url
         self._email = email
         self._password = password

src/watersmart/usage_data_test.py

@@ -45,4 +45,6 @@ def test_amend_with_local_ts_in_utc():
 @pytest.mark.asyncio
 async def test_disallow_non_watersmart_urls():
     with pytest.raises(AssertionError):
-        WatersmartClient("https://wsmart.example", "e@mail", "passw4rd")
+        WatersmartClient(
+            url="https://wsmart.example", email="e@mail", password="passw4rd"
+        )