Update info_credits.txt

Author: Bitl

game/quiver/info_credits.txt

@@ -1,4 +1,5 @@
 Credits:
 - TheBetaM for the custom item code.
 - Sae35 for help with compiling a few maps.
-- castaway.tf for documenting older weapon changes that inspired some Quiver Fortress weapon balances.
+- castaway.tf for documenting older weapon changes that inspired some Quiver Fortress weapon balances.
+- rafradek for some bot AI changes (sigsegv-mvm)