Switched to TTL cache for client rate limiter tracking

rate_limiters/tests/test_middleware_starlette.py

@@ -1,8 +1,9 @@
 from time import sleep
 
+from starlette.applications import Starlette
 from starlette.testclient import TestClient
 
-from middleware_starlette import app
+from middleware_starlette import app, RateLimiterMiddleware, routes
 
 def test_app_runs():
     client = TestClient(app)
@@ -46,4 +47,3 @@ def test_above_rate_limit():
     assert successful != 0
     assert rate_limited != 0
 
-