Merge branch 'prepare_sep_2021_release' into 'develop'

doc(release): draft for v1.2.0 release

See merge request oai/cn5g/oai-cn5g-amf!57

CHANGELOG.md

 # RELEASE NOTES: #
 
+## v1.2.0 -- September 2021 ##
+
+* AUSF connection
+* Support PDU Session Resource Modify procedure
+* Support HTTP2
+* Support AMF Event Exposure Services
+* Fix NIA0, NEA2
+* Fix potential AMF crash with UE/NGAP/NAS context
+* Fix N2 Handover
+* Fix Paging procedures
+
 ## v1.1.0 -- July 2021 ##
 
 * Session Release

docs/FEATURE_SET.md

@@ -57,7 +57,7 @@ Based on document **3GPP TS 23.501 V16.0.0 §6.2.1**.
 | 16     | Provide transport for Location Services messages between            |                    |                                             |
 |        | UE and LMF as well as between RAN and LMF.                          | :x:                |                                             |
 | 17     | EPS Bearer ID allocation for interworking with EPS.                 | :x:                |                                             |
-| 18     | UE mobility event notification                                      | :x:                |                                             |
+| 18     | UE mobility event notification                                      | :heavy_check_mark: |                                             |
 | 19     | Support for Control Plane CIoT 5GS Optimisation.                    | :x:                |                                             |
 | 20     | Provisioning of external parameters                                 | :x:                |                                             |
 | 21     | Support non-3GPP access networks                                    | :x:                |                                             |