patching the function for autocompletion

[manmio]

autocompletion does not work for me in my bash.
After patching the function from
cheat -l | cut -d' ' -f1
to
cheat -L | cut -d'/' -f5
autocompltion works fine for me.

[chrisallenlane]

With the Go rewrite (#470), this will no longer work. Implementing proper shell integration is a high priority now, though - see #476. There should be some integration updates coming over the next few days.