[stable/postgres] command in notes to run postgres client pod should have --restart=Never flag set. (#3325)

* command to run postgres client should not use rs

Modify the printed command to connect to the postgresql server pod to use a `--restart=Never` so that the pod instantiated that hosts a `psql` client is not backed by a ReplicaSet.

* Increment patch version number.

stable/postgresql/Chart.yaml

@@ -1,5 +1,5 @@
 name: postgresql
-version: 0.8.6
+version: 0.8.7
 description: Object-relational database management system (ORDBMS) with an emphasis on extensibility and on standards-compliance.
 keywords:
 - postgresql

stable/postgresql/templates/NOTES.txt

@@ -7,7 +7,7 @@ To get your user password run:
 
 To connect to your database run the following command (using the env variable from above):
 
-   kubectl run --namespace {{ .Release.Namespace }} {{ template "postgresql.fullname" . }}-client --rm --tty -i --image postgres \
+   kubectl run --namespace {{ .Release.Namespace }} {{ template "postgresql.fullname" . }}-client --restart=Never --rm --tty -i --image postgres \
    --env "PGPASSWORD=$PGPASSWORD" \{{- if and (.Values.networkPolicy.enabled) (not .Values.networkPolicy.allowExternal) }}
    --labels="{{ template "postgresql.fullname" . }}-client=true" \{{- end }}
    --command -- psql -U {{ default "postgres" .Values.postgresUser }} \