[change-log] for v5.7.0

erpnext/change_log/current/item_variants.md

@@ -1,6 +0,0 @@
-- Make Variants added to Item Master
-- Added ability to specify Range of Numeric Values in Attribute Master 
-- Fixed an issue in filtering Templates in Item List View
-- Added Patch to fetch Item Template Attributes
-- Allow Editing variant attribute in Variant. Add validation to check duplication.
-- Removed Manage Variants

erpnext/change_log/current/pos.md

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-- Set default Print Format for Point-of-Sale (POS) via **POS Profile**
-- Option to automatically print after submitting POS **Sales Invoice**

erpnext/change_log/v5/v5_7_0.md

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+- **Item Variants**
+	- Removed **Manage Variants** tool
+	- Use **Make Variant** button in the Item form to create new variants based on a template Item
+	- Added ability to specify Range of Numeric Values in Item Attribute	
+- Set default Print Format for Point-of-Sale (POS) via **POS Profile**
+- Option to automatically print after submitting POS **Sales Invoice**
+- **Communication** added to CRM module