remove unused import in test

diff --git a/tests/test_requests_async.py b/tests/test_requests_async.py
index 1d28261..3a5a762 100755 (executable)
--- a/tests/test_requests_async.py
+++ b/tests/test_requests_async.py
@@ -12,7 +12,6 @@ import select
 has_poll = hasattr(select, "poll")
 
 from requests import async
-import envoy
 
 sys.path.append('.')
 from test_requests import httpbin, RequestsTestSuite, SERVICES