Added changelog for version 4.50. Added Nitesh's name to AUTHORS list.

AUTHORS

@@ -2,6 +2,7 @@ Active Contributors
 
 "Abhijith Balan" <abhijith@dff.org.in>
 "Mohd. Talha Pawaty"<mtalha456@gmail.com>
+"Nitesh Chaughule"<nitesh@disroot.org>
 "Prajkta Patkar" <prajakta@dff.org.in>
 "Reshma Bhatawadekar" <reshma@dff.org.in>
 

CHANGELOG

+[9-January-2018 Release 4.50]
+* Function in Bill Wise API that returns all unpaid invoices.
+* Function in Bill Wise API that returns both unpaid and partially paid invoices.
+* Function in User API that returns list of users having same role and their role.
+* Function in User API that returns all data of a user(accessible only to admin).
+* All details of a user can be edited by admin.
+* Consignee details can be added in Delivery Note.
+* Function in Godowns API to return name and address of all godowns that contain products.
+* Modified PUT of Invoice API.
+
 [10-November-2017 Release 4.25 Update]
 * Permissions to Godown In Charge modified.
 * CESS field added in invoice and cash memo.