Added ability to enable SETENV in sudoers

Change-Id: Icee295720a5a2425390a1bcd588841897071938e
diff --git a/README.rst b/README.rst
index 30be47c..97420bc 100644
--- a/README.rst
+++ b/README.rst
@@ -157,6 +157,7 @@
           salt-ops-2nd:
             name: salt-ops
             nopasswd: false
+            setenv: true # Enable sudo -E option
             runas:
             - DBA
             commands: