Merge pull request #614 from SISheogorath/fix/mattermostVar

Fix mattermost breaking notes

Author: SISheogorath

lib/response.js

@@ -96,6 +96,7 @@ function responseHackMD (res, note) {
     twitter: config.isTwitterEnable,
     github: config.isGitHubEnable,
     gitlab: config.isGitLabEnable,
+    mattermost: config.isMattermostEnable,
     dropbox: config.isDropboxEnable,
     google: config.isGoogleEnable,
     ldap: config.isLDAPEnable,