Add . syntax for "Packer ${command} current-working-file"

Hey, Mark. FYI I read the issue submission and bug report doc you mentioned. Thanks for maintaining this plugin, it's great! Quick request: maybe this is already possible and I've just missed it: could you add the "." operator for "this file" so that vim commands like ":Packer validate ." would validate the current working file? I would do it, but I don't know what language that the plugin is written in, lol. If you want me to do it you'll have to give me some hints, I guess. Thanks, again!

-Jonas

[pgporada]

@jonassteinberg1 We'll look into this, good suggestion!

Hey, thanks. And, i was thinking about it afterwards and realized that the dot operator is even verbose: just :Packer $command could default to current working file.