add Lukas Drude to AUTHORS

[joeced]

Originally reported by: Mark Mikofski (Bitbucket: bwanamarko, GitHub: Unknown)

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@lukas_drude added patches and issues:

• https://bitbucket.org/bwanamarko/sphinxcontrib-matlabdomain/issues/31/python-like-string-detection-collides-with
• https://bitbucket.org/bwanamarko/sphinxcontrib-matlabdomain/issues/30/error-occurred-while-including-matlab-unit
• https://bitbucket.org/bwanamarko/sphinxcontrib-matlabdomain/issues/28/crlf-in-function-signature-causes-test

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• Bitbucket: https://bitbucket.org/bwanamarko/sphinxcontrib-matlabdomain/issue/45