Cache in-memory GitHub info between releases

[MarcoIeni]

Right now, I call git-cliff many times (one per crate in a cargo workspace).
At the moment, git-cliff calls github api for every commit of the release.
It would be nice if git-cliff keeps in memory the info it fetched from GitHub for every commit, to avoid calling GitHub again.

Additional context

Here is some pseudo code

fn get_git_cliff_instance() {
    // set github remote config
    let git_cliff_config = default_git_cliff_config();
    let git_cliff_instance = newGitCliff(git_cliff_config);
    let releases = [commits1, commits2];
    let changelog1 = git_cliff_instance.generate_changelog(releases[0]);
    // here git-cliff re-uses the info it found during the first calls
    let changelog1 = git_cliff_instance.generate_changelog(releases[1]);
}