Update imagemagick version #1
Description
The imagemagick version is
$ docker run -it v4tech/imagemagick /usr/bin/convert -version
Version: ImageMagick 6.9.6-8 Q16 x86_64 2016-12-26 http://www.imagemagick.org
Copyright: Copyright 1999-2017 ImageMagick Studio LLC
License: http://www.imagemagick.org/script/license.php
Features: Cipher Modules
Delegates (built-in): fontconfig freetype jng jpeg lcms ltdl png tiff webp zlib
It would be great if this could be updated to version 7.0.7