As of now, we request that developers no longer maintain the contents of ChangeLog files by hand.

The ChangeLog files are now generated at distribution time from the Git commit history.

For details see:

http://mono-project.com/Coding_Guidelines#Source_Code_Control

And in particular:

http://mono-project.com/Coding_Guidelines#Git_Workflow_Changes 

— That one dude from AntiTrust