Removed '--help' from help string as per request.

src/main.cpp

@@ -545,7 +545,7 @@ void usage(String argv0) {
 	print_usage_line(1, "version   print version");
 	print_usage_line(1, "report    print information useful to reporting a bug");
 	print_usage_line(0, "");
-	print_usage_line(0, "For further details on a command, use -help or --help after the command name");
+	print_usage_line(0, "For further details on a command, use -help after the command name");
 	print_usage_line(1, "e.g. odin build -help");
 }