bump mongo exporter to 0.39.0

Signed-off-by: drfaust92 <[email protected]>

charts/prometheus-mongodb-exporter/Chart.yaml

@@ -1,18 +1,18 @@
 apiVersion: v2
-appVersion: "0.31.0"
+appVersion: "0.39.0"
 description: A Prometheus exporter for MongoDB metrics
 home: https://github.com/percona/mongodb_exporter
 keywords:
-- exporter
-- metrics
-- mongodb
-- prometheus
+  - exporter
+  - metrics
+  - mongodb
+  - prometheus
 maintainers:
-- email: [email protected]
-  name: steven-sheehy
-- email: [email protected]
-  name: zeritti
+  - email: [email protected]
+    name: steven-sheehy
+  - email: [email protected]
+    name: zeritti
 name: prometheus-mongodb-exporter
 sources:
-- https://github.com/percona/mongodb_exporter
-version: 3.3.1
+  - https://github.com/percona/mongodb_exporter
+version: 3.4.0