-c flag parameters for ETA mode

[Senseikaii]

Hello,

I'm trying to launch VROOM in ETA mode but can't do it using vroom-express.
Do you have any recommendations on how I must launch it ?

[jcoupey]

You could simply add the -c flag to the command-line options passed to the system call (lookup reqOptions in file index.js). If you hard-code this, you won't be able to do regular requests any more though.

The best way to do it would be to allow overriding the -c flag on a per-request basis, exactly in the same way as with -g. A PR for this would actually be welcome.

[Senseikaii]

Okay, that's what I though too. Will try to work on this.

#71

[jcoupey]

Done in #71.