doc(release): prepare release notes for 2021-Q4 release (v1.3)

Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>

CHANGELOG.md

 # RELEASE NOTES: #
 
+## v1.3.0 -- January 2022 ##
+
+* Build fixes
+* Deployment fixes (wait launch of NRF Client until VPP is getting ready)
+
 ## v1.2.1 -- October 2021 ##
 
 * Initial Public Release