nrf_modem: update changelog

Update changelog with nrf_modem release.

Signed-off-by: Eivind Jølsgard <[email protected]>

Author: eivindj-nordic

nrf_modem/doc/CHANGELOG.rst

@@ -9,6 +9,30 @@ Changelog
 
 All notable changes to this project are documented in this file.
 
+nrf_modem 3.0.99
+****************
+
+Core library
+============
+
+AT interface
+============
+
+Sockets
+=======
+
+* Added:
+
+  * The :c:func:`nrf_socket_data_enabled_set` function to enable and disable data traffic through the socket interface.
+  * The :c:func:`nrf_socket_data_enabled_get` function to retrieve the current data enabled state.
+  * The :c:macro:`NRF_SEC_TAG_TLS_INVALID` macro as a designated value to represents an invalid :c:type:`nrf_sec_tag_t`.
+
+Softsim
+=======
+
+DECT NR+
+========
+
 nrf_modem 3.0.0
 ***************