Update THANKS file

Add all new Git commit authors to the THANKS.in file.

THANKS.in

@@ -286,3 +286,19 @@ Fabio Rueda
 Gabriele Tozzi
 Sebastian Nohn
 Emmanuel Dreyfus
+Booker C. Bense
+Daniël van Eeden
+Dominique Broeglin
+Erwan Ben Souiden
+Gianluca Varisco
+Joerg Linge
+Jonathan Milby
+Juan Carlos Fernandez
+Lionel Cons
+Marc Huffnagle
+Mark Keisler
+Pall Sigurdsson
+Sebastian Schmidt
+Simon Kainz
+Steve Weinreich
+Tim Laszlo