added shortcut for the flameshot screenshot tool

i3_config

@@ -137,6 +137,7 @@ bindsym $Mod+Return exec st
 bindsym $Mod+Shift+f exec firefox
 bindsym $Mod+Shift+m exec midori
 bindsym $Mod+e exec pcmanfm
+bindsym F12 exec flameshot gui
 
 # VOLUME
 bindsym XF86AudioRaiseVolume exec amixer sset Master 5+