GitHub pagination was limiting the result to 30 issues.
This fix makes the changelog script return up to 100
issues. Will have to add a loop to fetch more once we
merge more than 100 PR's that should be added to the
changelog.
Also, fixes a bug where issues that were not included
in the milestone were being returned.
* Docs: Updated changelog for 6.1 release
Also Updates the changelog cli task to group issues into bug fixes
and not bug fixes.
* Minor changelog fixes
