Explicitly acknowledge fishtest authors.
Their efforts are almost invisible, but essential for the project.
Many thanks to https://github.com/glinscott/fishtest/blob/master/AUTHORS !
No functional change.
Torsten Franz (torfranz)
Uri Blass (uriblass)
Vince Negri
Torsten Franz (torfranz)
Uri Blass (uriblass)
Vince Negri
+
+# Additionally, we acknowledge the authors of fishtest,
+# an essential framework for the development of Stockfish:
+# https://github.com/glinscott/fishtest/blob/master/AUTHORS