Show effect in screenshots option - feature request

[Wise Melon]

I was recently trying to show a friend what redshift looked like but was unable to because the effect is not present in screenshots, which may be useful in some cases, but not in all especially when one is trying to show others the app in action. So I think that there should be an option (which is off by default) which allows you to make it so that the effect appears in screenshots too and is not stripped from them.

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OS Information:

    LSB Version: core-2.0-amd64:core-2.0-noarch:core-3.0-amd64:core-3.0-noarch:core-3.1-amd64:core-3.1-noarch:core-3.2-amd64:core-3.2-noarch:core-4.0-amd64:core-4.0-noarch:core-4.1-amd64:core-4.1-noarch
    Distributor ID: Ubuntu
    Description: Ubuntu 15.10
    Release: 15.10
    Codename: wily
    Flavour: GNOME
    GNOME Version: 3.18

Package Information:

    redshift:
      Installed: 1.10-5ubuntu1
      Candidate: 1.10-5ubuntu1
      Version table:
     *** 1.10-5ubuntu1 0
            500 http://archive.ubuntu.com/ubuntu/ wily/universe amd64 Packages
            100 /var/lib/dpkg/status

    redshift-gtk:
      Installed: 1.10-5ubuntu1
     Candidate: 1.10-5ubuntu1
      Version table:
     *** 1.10-5ubuntu1 0
            500 http://archive.ubuntu.com/ubuntu/ wily/universe amd64 Packages
            100 /var/lib/dpkg/status