Change log and Sponsors page

erpnext/change_log/v5/v5_1_5.md

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+- Customer's credit days based on fixed days / last day of the next month - `Sponsored by McLean Images`
+- Production Order is not allowed against Item Template (for Variants)
+- Currency symbol fixed for outstanding amount and advance amount field in Sales Invoice
+- A Contact can be linked to Customer, Supplier and Sales partner at the same time
+- Validation added to prevent task being closed with open dependent tasks
+- Blocked stock transactions against an expired batch
+- Added Employees in Newsletter List
+- Link Address to Customer / Supplier / Lead, based on logged-in user, if created in portal

sponsors.md

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+- [CWT (connector & wire technology GmbH)](http://www.cwt-assembly.com/)
+- [Pinnacle GIS](http://pinnaclegis.com.au/)
+- [Rohit Industries](www.rigpl.com)
+- [McLean Images](www.mcleans.net.au)