Changed requirements to version 2.22.0

Fixes: ERROR: requests 2.20.0 has requirement urllib3<1.25,>=1.21.1, but you'll have urllib3 1.25.5 which is incompatible.

requirements.txt

@@ -18,7 +18,7 @@ natsort==5.5.0
 nsone==0.9.100
 ovh==0.4.8
 python-dateutil==2.6.1
-requests==2.20.0
+requests==2.22.0
 s3transfer==0.1.13
 six==1.11.0
 setuptools==38.5.2