Make no argument invokation useful

[pzerone]

Currently, if no commandline arguments are passed the program quits. It would be better if invoking with no arguments cause the program to open the editor with all the files/folder in the current directory to rename.
This was my thought process when I installed the program for the first time. I was confused when the program exited when tried running the program with no args. Had to look at the source code to figure out that it exits if no args are provided

My current workaround for this is to add a shell alias like this

alias br="vimv *"

I mean i understand it's a small change.. but hey, it's two less keys pressed

[dmulholl]

Thanks, good idea :)

Implemented in v3.0.0.