added info about exiftool
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* [github.com/threatstack/libmagic](https://github.com/threatstack/libmagic)
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* [pillow.readthedocs.io](https://pillow.readthedocs.io/en/5.3.x/installation.html#external-libraries)
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### Optional requirements
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If you wish to use the `--caption` flag to add image captions read from EXIF comment metadata you will need a utility called `exiftool`.
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You can install it via your package manager. For other options please consult the website: [https://www.sno.phy.queensu.ca/~phil/exiftool/](https://www.sno.phy.queensu.ca/~phil/exiftool/)
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## Install It
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```bash
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