Update AUTHORS.md

AUTHORS.md

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 See also [THANKS](https://github.com/uclouvain/openjpeg/blob/master/THANKS.md)
 
 David Janssens designed and implemented the first version of OpenJPEG.
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 Kaori Hagihara designed and implemented the first version of OpenJPIP.
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 Jerome Fimes implemented the alpha version of OpenJPEG 2.0.
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 Giuseppe Baruffa added the JPWL functionalities.
-Mickaël Savinaud implemented the final OpenJPEG 2.0 version based on a big merge between 1.5 version and alpha version of 2.0.
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+Mickaël Savinaud implemented the final OpenJPEG 2.0 version based on a big merge between 1.5 version and alpha version of 2.0.
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 Mathieu Malaterre participated to the OpenJPEG 2.0 version and improved the libraries and utilities. 
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 Yannick Verschueren, 
 Herve Drolon, 
 Francois-Olivier Devaux,