A "thematic break"[1] is composed of 3 or more characters (-, _,
or *). The current separator using only 2 characters between the main
body of the PR and the footer / addendum makes it more difficult to
interpret the message.
Update to 3 so e.g. the mergebot can strip the footer.
[1]: https://spec.commonmark.org/0.30/#thematic-breaksclosesodoo/odoo#101148
X-original-commit: c7bf932c9eb2fc9bc34c653c51bce1552d6afb54
Signed-off-by: Martin Trigaux (mat) <mat@odoo.com>
Signed-off-by: Xavier Morel (xmo) <xmo@odoo.com>