Outside Collaborators Org-Wide v2.0.0

This release introduces a breaking change in the way we manage the group mentioning mechanism.
To avoid interferences with MathJax, the escape char $ is now replaced by !.
See the main documentation for more info.

What's Changed

• Changed the escape char for group mentioning by @pattacini in #141

Full Changelog: v1.2.1...v2.0.0