[cherry-pick] Update chart icon (#111)

/cherry-pick

Signed-off-by: Tamal Saha <tamal@appscode.com>

Co-authored-by: Tamal Saha <tamal@appscode.com>

Author: 1gtm

charts/stash-postgres/Chart.yaml

@@ -4,7 +4,7 @@ name: stash-postgres
 version: 11.2-beta.20200709
 appVersion: 11.2-beta.20200709
 home: https://stash.run
-icon: https://cdn.appscode.com/images/icon/stash.png
+icon: https://cdn.appscode.com/images/products/stash/addons/postgres-stash-addon.png
 sources:
 - https://github.com/stashed/postgres
 maintainers: