gif generator callback error

[x] Check that you are up-to-date with the master branch of keras-vis. You can update with: pip install git+git://github.com/raghakot/keras-vis.git --upgrade --no-deps
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[x] Provide a link to a GitHub Gist of a Python script that can reproduce your issue (or just copy the script here if it is short).

This will throw an error

because deprocess_input's output must be converted to be used in gif

A fix would be:

         img = utils.deprocess_input(wrt_value[0]).astype('uint8')

Demo Generating animated gif of optimization progress from Documentation will currently not work.

raghakot / keras-vis