rename: underscore -> hyphen

arch_setup -> arch-setup
audio_notify -> audio-notify
update README in consequence

.config/sxhkd/sxhkdrc

@@ -3,9 +3,9 @@
 # System stuff
 
 super + F1
-		pulsemixer --toggle-mute; audio_notify
+		pulsemixer --toggle-mute; audio-notify
 super + {F2, F3}
-		pulsemixer --change-volume {-5, +5}; audio_notify
+		pulsemixer --change-volume {-5, +5}; audio-notify
 
 super + {F5, F6}
 		sbacklight {dec,inc}

.local/bin/README.md

@@ -6,9 +6,9 @@
 
 ## Scripts
 
-- arch_setup : my personnal machine setup script
+- arch-setup : my personnal machine setup script
 - audio-notify : send a notification when audio level is changed
-- backlight_notify : send a notification when backlight level is changed
+- backlight-notify : send a notification when backlight level is changed
 - bibinput : add a **.bib** entry through `dmenu`
 - bibshow : retrieve a **.bib** reference and copy to `xclip`
 - bulk : execute batch commands through your favorite $EDITOR