This also allows the option to put extra paragraphs after the BREAKING CHANGE
message while properly displaying the breaking change message. Useful, for
example, to add signed-off or co-authored lines.

Fixes #9505

Antigen doesn't call `compinit` until the user prompt is about to be shown,
which means `_cache_invalid` isn't automatically autoloaded. This patch
fixes that, though we should work towards a better caching mechanism.

Fixes #9490

BREAKING CHANGE: the git config option to skip running `git_prompt_info` has changed from `oh-my-zsh.hide-status` to `oh-my-zsh.hide-info` (#9188).

Show the remote branch the local branch is tracking if `ZSH_THEME_GIT_SHOW_UPSTREAM`
is set, like so: `ZSH_THEME_GIT_SHOW_UPSTREAM=1`.
Co-authored-by: Marc Cornellà <marc.cornella@live.com>

BREAKING CHANGE: in `common-aliases`, the `fd` alias won't be defined if `fd` is installed (https://github.com/sharkdp/fd).

Co-authored-by: Marc Cornellà <marc.cornella@live.com>

Co-authored-by: Marc Cornellà <marc.cornella@live.com>

Co-authored-by: Marc Cornellà <marc.cornella@live.com>

Co-authored-by: Marc Cornellà <marc.cornella@live.com>

BREAKING CHANGE: the `upgrade_oh_my_zsh` function now calls `omz update` directly.

Also fixed a call to a defunct display:type-header function in displaying
breaking changes.

Fixes #9495

check_output() in get_tagname_or_hash() returns bytes instead of str in
python3.  Decode the return value to utf-8, this works in both python2
and python3.
Co-authored-by: Stimim Chen <stimim@google.com>

I used _ which is a convention in other languages, but in shell scripting
$_ is a special variable set by the shell, and in Zsh versions older than
5.0.6 it complains for being a `read-only variable`.

Fixes #9482

Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>