[change-log] added change log for v9.0.0 (#10756)
* [change-log] added change log for v9.0.0
* Update v9_0_0.md
diff --git a/erpnext/change_log/v9/v9_0_0.md b/erpnext/change_log/v9/v9_0_0.md
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+#### POS
+- Now user has an option to enable or disable Offline POS mode from POS Settings
+- Provision to select the Item's serial number from the dropdown while adding item in the cart
+- Indicator for stock availability in Online POS Mode.
+
+#### Subscription
+- Setup recurring documents using **Subscription**
+- User can schedule the subscription for doctypes other than Sales Invoice, Purchase Invoice etc.