Repaired reference to API

tests/test_api.py

@@ -14,7 +14,7 @@ class TestServerBaseClass(unittest.TestCase):
 
         self.server_process = Process(
             target=uvicorn.run,
-            args=('api:app', ),
+            args=('model_server.api:app', ),
             kwargs={'host': host, 'port': port, 'log_level': 'debug'},
             daemon=True
         )