Add mmosts:// to readme for Mattermost (#398)

README.md

@@ -53,7 +53,7 @@ The table below identifies the services this tool supports and some example serv
 | [LaMetric Time](https://github.com/caronc/apprise/wiki/Notify_lametric) | lametric:// | (TCP) 443 | lametric://apikey@device_ipaddr<br/>lametric://apikey@hostname:port<br/>lametric://client_id@client_secret
 | [Mailgun](https://github.com/caronc/apprise/wiki/Notify_mailgun) | mailgun:// | (TCP) 443 | mailgun://user@hostname/apikey<br />mailgun://user@hostname/apikey/email<br />mailgun://user@hostname/apikey/email1/email2/emailN<br />mailgun://user@hostname/apikey/?name="From%20User"
 | [Matrix](https://github.com/caronc/apprise/wiki/Notify_matrix) | matrix:// or matrixs://  | (TCP) 80 or 443 | matrix://hostname<br />matrix://user@hostname<br />matrixs://user:pass@hostname:port/#room_alias<br />matrixs://user:pass@hostname:port/!room_id<br />matrixs://user:pass@hostname:port/#room_alias/!room_id/#room2<br />matrixs://token@hostname:port/?webhook=matrix<br />matrix://user:token@hostname/?webhook=slack&format=markdown
-| [Mattermost](https://github.com/caronc/apprise/wiki/Notify_mattermost) | mmost://  | (TCP) 8065 | mmost://hostname/authkey<br />mmost://hostname:80/authkey<br />mmost://user@hostname:80/authkey<br />mmost://hostname/authkey?channel=channel<br />mmosts://hostname/authkey<br />mmosts://user@hostname/authkey<br />
+| [Mattermost](https://github.com/caronc/apprise/wiki/Notify_mattermost) | mmost:// or mmosts:// | (TCP) 8065 | mmost://hostname/authkey<br />mmost://hostname:80/authkey<br />mmost://user@hostname:80/authkey<br />mmost://hostname/authkey?channel=channel<br />mmosts://hostname/authkey<br />mmosts://user@hostname/authkey<br />
 | [Microsoft Teams](https://github.com/caronc/apprise/wiki/Notify_msteams) | msteams://  | (TCP) 443   | msteams://TokenA/TokenB/TokenC/
 | [Nextcloud](https://github.com/caronc/apprise/wiki/Notify_nextcloud) | ncloud:// or nclouds:// | (TCP) 80 or 443 | ncloud://adminuser:pass@host/User<br/>nclouds://adminuser:pass@host/User1/User2/UserN
 | [Notica](https://github.com/caronc/apprise/wiki/Notify_notica) | notica://  | (TCP) 443   | notica://Token/