Able to group changes per tag

[vinhlh]

Currently, if I run this command

GITHUB_AUTH= lerna-changelog --tag-from v0.0.1

It will combine all PRs into the latest release. Example current version is v0.0.9, it will combine all PRs between v0.0.1 to 0.0.9 into v0.0.9's changelog.

If we can group them into tags like

v0.0.1
  release 1
  release 2
v0.0.2
  release 3
...
v0.0.9
  release xx

We can do generate CHANGELOG automatically via CI.