add --wildcards to tar options in README

alsa-project/alsa-ucm-conf pull request #232 was opened from nodens:

Without it, at least on some recent tar version, it won't work: --wildcards is the default only for exclusions, not for member selection. This tends to confuse users, even though it's just an example (e.g #220)

Request URL : https://github.com/alsa-project/alsa-ucm-conf/pull/232 Patch URL : https://github.com/alsa-project/alsa-ucm-conf/pull/232.patch Repository URL: https://github.com/alsa-project/alsa-ucm-conf