Bro's option

Hi,
Just a really small typo in Bro 2.4 release - in src/main.cc program option, you removed -G from option listing, but kept case ‘G’.
M

In Bro 2.3.2, the "-G" option didn't work (it didn't accept an argument)
and it was never listed in Bro's usage output ("bro -h").

I'll remove the dead 'G' code. Thanks, Martina.

Robin