Removed unneeded dependency on num (again)
Removed unneeded dependency on num (again)

This was removed before in
https://github.com/PistonDevelopers/graphics/commit/c814a6786cc2dfad10d4
bf2133fca0551d540e34#diff-80398c5faae3c069e4e6aa2ed11b28c0, but somehow
sneaked back in
https://github.com/PistonDevelopers/graphics/commit/c02c93aae8a9c12576ab
fe93358fd4bbdd822525#diff-80398c5faae3c069e4e6aa2ed11b28c0. The line is
not marked as added, so something weird must have happened.

PistonDevelopers/graphics,bvssvni/graphics,mitchmindtree/graphics