* feat(alert): Add group-specific to email list Add group-specific to list for email alert https://github.com/TwiN/gatus/issues/96 Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com> * docs: update Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com> * Update README.md * Update README.md * Update README.md * chore: update Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com> * Update README.md