doc(release): prepare release notes for v1.3

Signed-off-by: Raphael Defosseux <raphael.defosseux@openairinterface.org>

CHANGELOG.md

 # RELEASE NOTES: #
 
+## v1.3.0 -- January 2022 ##
+
+* Update NWI from NF profile
+* Update SMF profile
+* Fix retrieving the list of NWI
+* Fix entreprise IE decoding
+* Fix issue for UPF selection
+* Docker optimization
+
 ## v1.2.1 -- October 2021 ##
 
 * Fix build issue