Fixed "unknown command" on vanilla commands with no args (even though it's intended behavior...)

src/main/java/org/bukkit/command/defaults/SayCommand.java

@@ -39,6 +39,6 @@ public class SayCommand extends VanillaCommand {
 
     @Override
     public boolean matches(String input) {
-        return input.startsWith("say ");
+        return input.startsWith("say ") || input.equalsIgnoreCase("say");
     }
 }