Add GNU ELPA (gnu) to Cask source

zonuexe · zonuexe · commit 3885058a4939 · 2023-04-10T21:06:25.000+09:00
diff --git a/Cask b/Cask
@@ -1,5 +1,6 @@
 (package "php-mode" "1.24.3" "Major mode for editing PHP code")
 (source melpa)
+(source gnu)
 
 (package-file "lisp/php-mode.el")
 
