Fix newline with code block

Author: geetfun

default.rb

@@ -222,9 +222,12 @@
 CODE
 
 # Update .gitignore
-append_file '.gitignore', '.db-seeded\r\n'
-append_file '.gitignore', '.db-created\r\n'
-append_file '.gitignore', '.DS_Store\r\n'
+append_file '.gitignore', <<~CODE
+.db-seeded
+.db-created
+.DS_Store
+
+CODE
 
 puts"""