Not possible to define multiple --exif attributes

[untitledlt]

Thanks for a nice module!
To set multiple EXIF attributes you must define them multiple time like this:

raspistill --exif IFD0.Copyright=XXX --exif IFD0.Artist=YYY -o out.jpg

Attributes in this module are passed as javascript object so it's not possible to define them multiple times. You should allow to specify array, like so:

new RaspiCam({
    exif: ['IFD0.Copyright=XXX', 'IFD0.Artist=YYY']
})

or some other way. Good luck!