xmonad.hs: slack to ws 0

xmonad/xmonad.hs

@@ -19,6 +19,7 @@ myManageHook = composeAll [
 	className =? "Firefox"    --> doShift "1",
 	className =? "Iceweasel"  --> doShift "1",
 	className =? "Chromium-browser" --> doShift "1",
+	className =? "Slack"      --> doShift "0",
 	className =? "Xfce4-notifyd" --> doF W.focusDown,
 	className =? "MPlayer"    --> doFloat,
 	className =? "mplayer2"   --> doFloat,