Starting with Gramps 3.0.0, we no longer have a ChangeLog file.
Instead, the list of changes is generated automatically using the standard svn2cl script.
Note that svn2cl is not included in the base installation of subversion. With a Debian-based distro such as Ubuntu, you can get svn2cl as follows:
sudo apt-get install subversion-tools
or
sudo apt-get install svn2cl
There typically are two ChangeLog files needed for releases; one in the main directory, and one in the po directory. You can generate these files with the following commands:
cd gramps30 svn2cl --reparagraph --include-rev --authors=src/data/authors.xml cd po svn2cl --reparagraph --include-rev --authors=../src/data/authors.xml