fix: return str instead of list when executing tldr -l (#222)

* fix: return `str` instead of `list` when executing `tldr -l`

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Co-authored-by: Lena <[email protected]>

Author: uunnxx

tldr.py

@@ -504,7 +504,7 @@ def main() -> None:
         parser.print_help(sys.stderr)
         sys.exit(1)
     if options.list:
-        print(get_commands(options.platform))
+        print('\n'.join(get_commands(options.platform)))
     elif options.render:
         for command in options.command:
             if os.path.exists(command):