Fix parameter order in get model method.

Change-Id: Ia853579f192fca3b4438f418c50a340129489be7
Signed-off-by: Patricia Reinoso <patricia.reinoso@canonical.com>
diff --git a/n2vc/temporal_libjuju.py b/n2vc/temporal_libjuju.py
index a4b7752..c13d244 100644
--- a/n2vc/temporal_libjuju.py
+++ b/n2vc/temporal_libjuju.py
@@ -111,7 +111,7 @@
             if need_to_disconnect:
                 await self.disconnect_controller(controller)
 
-    async def get_model(self, model_name: str, controller: Controller) -> Model:
+    async def get_model(self, controller: Controller, model_name: str) -> Model:
         return await controller.get_model(model_name)
 
     async def list_models(self) -> List[str]: