No session notices on update cart action

[davist11]

Description

When using the update-cart action it would be really nice to have a session notice of success. This is useful if you aren't redirecting to the cart.

Steps to reproduce

1. Add item to cart
2. No session notice is available

Additional info

• Craft version: Craft Pro 3.0.11
• PHP version: 7.1.12
• Database driver & version: MySQL 5.6.38
• Plugins & versions:

Algolia	1.0.0
Amazon S3	1.0.8
Asset Rev	6.0.0
AsyncQueue	1.3.2
Audit	2.0.1
Automatic Site Switch	1.0.0
Calendar	2.0.3
Category Utilities	1.0.0
Certificates	1.0.0
Converge	1.0.0
Craft Commerce	dev-master
Environment Label	3.1.4
Feed Me	3.0.0-beta.15
Field Manager	2.0.2
Flat Categories	2.0.0
Forms	2.0.4
Freeform Pro	2.0.4
Geo Cookie	1.1.2
Hamilton Utility	1.0.0
Importer	1.0.0
Inlin	2.0.0
Inventory	1.0.0
OrderExporter	1.0.0
Redactor	2.1.0
Sidebar Toggle	2.0.0
SimpleSentry	1.0.0
Super Table	2.0.7
Taxes	1.0.0
Twig Perversion	2.0.3

[lukeholder]

What should the flash notice say? "Cart updated successfully." and "Cart unsuccessfully updated"?

[davist11]

Seems reasonable to me