DOC: update documentation for helm test --logs

Signed-off-by: Jeff Knurek <j.knurek@travelaudience.com>

docs/helm/helm_test.md

@@ -20,6 +20,7 @@ helm test [RELEASE] [flags]
 ```
       --cleanup               Delete test pods upon completion
   -h, --help                  help for test
+      --logs                  Dump the logs from test pods (this runs after all tests are complete, but before any cleanup
       --parallel              Run test pods in parallel
       --timeout int           Time in seconds to wait for any individual Kubernetes operation (like Jobs for hooks) (default 300)
       --tls                   Enable TLS for request
@@ -46,4 +47,4 @@ helm test [RELEASE] [flags]
 
 * [helm](helm.md)	 - The Helm package manager for Kubernetes.
 
-###### Auto generated by spf13/cobra on 16-May-2019
+###### Auto generated by spf13/cobra on 6-Aug-2019