Update domains.csv for McGill (#280)

share/domains.csv

@@ -266,3 +266,4 @@ yandex.ua,imap.yandex.com,993,smtp.yandex.com,587
 zoho.com,imap.zoho.com,993,smtp.zoho.com,465
 tlu.edu,imap-mail.outlook.com,993,smtp-mail.outlook.com,587
 mailo.com,mail.mailo.com,993,mail.mailo.com,465
+mail.mcgill.ca,outlook.office365.com,993,smtp.office365.com,587