Use Gitter notifications
Use Gitter notifications

   * Added a webhook notification for Gitter notifications.
   * Disabled email notifications because @yorik's configuration
     effectively did that but setting email to false is shorter

Fat-Zer/FreeCAD_sf_master,Fat-Zer/FreeCAD_sf_master,Fat-Zer/FreeCAD_sf_master,usakhelo/FreeCAD,bblacey/FreeCAD-MacOS-CI,Fat-Zer/FreeCAD_sf_master,bblacey/FreeCAD-MacOS-CI,usakhelo/FreeCAD,bblacey/FreeCAD-MacOS-CI,usakhelo/FreeCAD,usakhelo/FreeCAD,bblacey/FreeCAD-MacOS-CI,bblacey/FreeCAD-MacOS-CI,usakhelo/FreeCAD,usakhelo/FreeCAD,Fat-Zer/FreeCAD_sf_master,usakhelo/FreeCAD,bblacey/FreeCAD-MacOS-CI,bblacey/FreeCAD-MacOS-CI