Add 3GPP TS 29.154 V15.3.0 (2019-09) Add AVPs: - Network-Area-Info-List, OctetString, code 4201, section 5.3.2 - Number-Of-UEs, Unsigned32, code 4209, section 5.3.10 - Reference-Id, OctetString, code 4202, section 5.3.3 - Transfer-Request-Type, Unsigned32, code 4203, section 5.3.4 - Time-Window, Grouped, code 4204, section 5.3.5 - Transfer-End-Time, Time, code 4205, section 5.3.6 - Transfer-Policy, Grouped, code 4207, section 5.3.8 - Transfer-Policy-Id, Unsigned32, code 4208, section 5.3.9 - Transfer-Start-Time, Time, code 4206, section 5.3.7 - Access-Network-Reports, Grouped, code 4210, section A.6.3.2 - Event-Configuration, Grouped, code 4211, section A.6.3.3 - Event-Configuration-State, Unsigned32, code 4212, section A.6.3.4 - Event-Configuration-Status, Grouped, code 4213, section A.6.3.5 - Event-Reporting-Results, Unsigned32, code 4214, section A.6.3.6 - Event-Reports, Grouped, code 4215, section A.6.3.7 - Extended-SCEF-Reference-ID, Unsigned64, code 4216, section A.6.3.8

The digested changelog can be found under:
 contrib/debian/changelog
 
You can also find the exhaustive list of change using mercurial history, 
or at the following URL: http://www.freediameter.net/hg/freeDiameter/shortlog