Update requests to version 2.20.0 or later

tivaliy · tivaliy · commit 8da463bd599a · 2019-02-07T19:53:19.000+02:00
diff --git a/requirements.txt b/requirements.txt
@@ -3,4 +3,4 @@
 # process, which may cause wedges in the gate later.
 pbr>=1.6 # Apache-2.0
 cliff>=2.10.0 # Apache-2.0
-requests!=2.9.0,>=2.8.1 # Apache-2.0
+requests>=2.20.0
