Fix kubernetes module version to 3.0.0

Alexander Kukushkin · Alexander Kukushkin · commit d3a729feb26b · 2017-11-23T19:37:22.000+01:00
The lates one has some problems with none values received instead of empty list: kubernetes-client/python#376
diff --git a/requirements.txt b/requirements.txt
@@ -13,4 +13,4 @@ tzlocal
 python-dateutil
 psutil
 cdiff
-kubernetes
+kubernetes==3.0.0
