Update CHANGELOG.md

[RHmais-IM]

Checklist before requesting a review

Please delete options that are not relevant.

• I have performed a self-review of my code.
• I have added tests (when available) that prove my fix is effective or that my feature works.
• I have updated the CHANGELOG with a short functional description of the fix or new feature.
• This change requires a documentation update.

Description

• It fixes Mail Collector: dropdownAuthorization.php AJAX call missing "/glpi" subfolder path when GLPI installed in a subdirectory #141
• Use CFG_GLPI root_doc for dropdownAuthorization AJAX path

[stonebuzz]

Please update original pull request

#142