Add nl6720 as additional project maintainer
README.rst: Add nl6720 with PGP key ID BB8E6F1B81CF0BB301D74D1CBF425A01E68B38EF as additional project maintainer.
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README.rst: Add nl6720 with PGP key ID BB8E6F1B81CF0BB301D74D1CBF425A01E68B38EF as additional project maintainer.