[CI skip] update authors and mailmap

.mailmap

 Piotr Benedysiuk <benedysiuk.piotr@gmail.com>
 Toeno van der Sar <t.vandersar@tudelft.nl>
+Joana Fraxanet Morales <joana.fraxanet@gmail.com>
+Bowy La Riviere <b.m.lariviere@student.tudelft.nl>
+Lex Huismans <lexhuismans@outlook.com>
+Gian de Bruin <giandebruin@hotmail.com>

AUTHORS.md

@@ -9,6 +9,12 @@ The following people contributed to making of these lecture notes:
 * Sander Otte
 * Sathish Kumar RK
 * Toeno van der Sar
+* Hugo Kerstens
+* Bowy La Riviere
+* Matthias Flor
+* Radoica Draškić
+* Lex Huismans
+* Gian de Bruin
 
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