README.md: Add python3-textile install suggestion

Depending on your system, "pip install textile" may not work:

    Traceback (most recent call last):
      File "./scripts/myhtml.py", line 8, in <module>
	import textile
    ModuleNotFoundError: No module named 'textile'

You may have to install the distro's "python3-textile" package instead.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>

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