Update requirements.txt

Stanisław · web-flow · commit 7c17e8e5ba1b · 2018-09-07T18:44:10.000+02:00
diff --git a/requirements.txt b/requirements.txt
@@ -32,4 +32,4 @@ txaio==2.9.0
 urllib3==1.22
 Werkzeug==0.14.1
 yarl==1.1.1
-pyudev==0.21.1
+pyudev==0.21.0
