fix: Properly pass the url argument (#82)

We need this patch in order to use other API environments.

Author: olivas-bo

exoscale/api/v2.py

@@ -99,7 +99,7 @@ def _sleep(start_time):
 
 class Client(BaseClient):
     def __init__(self, key, secret, *args, url=None, **kwargs):
-        super().__init__(*args, **kwargs)
+        super().__init__(*args, url=url, **kwargs)
         self.WAIT_ABORT_ERRORS_COUNT = 5
 
         client = requests.Session()