Run Script missing #!perl interpertor call for bash

[kthakore]

Just so you can run it easy. here is a diff

index 6776d39..5d340d4 100644
--- a/bin/perl_invaders.pl
+++ b/bin/perl_invaders.pl
@@ -1,3 +1,4 @@
+#!perl -w
use 5.010; use strict; use warnings;
use SDL::App;
use SDL::Event;