♻ use double quotes instead of single quotes in nix-shell calls

Author: vyp

bin/mdl

@@ -1,5 +1,5 @@
 #! /usr/bin/env nix-shell
-#! nix-shell -i 'guile -e main' -p guile nano ffmpeg mpv atomicparsley youtube-dl
+#! nix-shell -i "guile -e main" -p guile nano ffmpeg mpv atomicparsley youtube-dl
 !#
 ;; vim: ft=scheme
 

bin/upd

@@ -1,5 +1,5 @@
 #! /usr/bin/env nix-shell
-#! nix-shell -i 'guile -e main' -p guile git
+#! nix-shell -i "guile -e main" -p guile git
 !#
 ;; vim: ft=scheme