async-generator is a test dependency

RazerM · RazerM · commit 9ed2beecad14 · 2018-05-11T13:42:22.000+02:00
Was previously installed because trio depends on it
diff --git a/test-requirements.txt b/test-requirements.txt
@@ -1,3 +1,4 @@
 pytest
 pytest-cov
 pytest-asyncio; python_version >= '3.5'
+async-generator; python_version >= '3.5'
