Merge pull request #3628 from nabinhait/sponsors

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](http://www.mcleans.net.au)**
+- 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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+## Sponsors
+
+
+#### General
+
+- [CWT (connector & wire technology GmbH)](http://www.cwt-assembly.com/) (2013)
+- [Pinnacle GIS](http://pinnaclegis.com.au/) (2014)
+- [Rohit Industries](www.rigpl.com) (2014)
+
+
+#### Features
+
+<table>
+	<tbody>
+		<tr>
+			<td style="width: 30%">
+				<a href="http://www.mcleans.net.au">McLean Images</a>
+			</td>
+			<td>
+				For credit period setting options
+				for Customer <a href="https://github.com/frappe/erpnext/issues/3451">#3451</a>
+			</td>
+		</tr>
+	</tbody>
+</table>