build: bump up helm chart to 0.1.5 (#375)

Author: burningalchemist

helm/Chart.yaml

@@ -2,7 +2,7 @@ apiVersion: v2
 name: sql-exporter
 description: Database agnostic SQL exporter for Prometheus
 type: application
-version: 0.1.4
+version: 0.1.5
 appVersion: 0.12.3
 keywords:
   - exporter