Version 3.1.0

• feat: additional discount percentage
• fix: auto set batch no
• fix: get_item_detail
• fix: not getting actual qty correctly
• fix: item qty and batch qty vaildation
• fix: get item qty in get_item_detail
• chore: remove frappe and erpnext from requirements.txt
• feat: use expired entrys in loyalty points
• feat: confirmation & validation APIs & get_token
• feat: POS Awesome integration with Mpesa C2B
• feat: checkbox for submit Mpesa payment
• feat: show customer's address in customer search field
• feat: show Customer's Purchase Order
• feat: Allow Print Last Invoice
• fix: return item with Serial No
• fix: return non update stock invoice
• fix: cannot read property posa_delivery_date
• fix: get uom price list rate