move test package to dev_dependencies
move test package to dev_dependencies

noticed that my `pubspec.lock` was injected with `csslib` `html` _packages_ and narrowed it down to your package. 
im not entirely sure how package `dependencies` and `dev_dependencies` relate to each other with dart and pub or how trensitive dependencies get added. but i believe its best practice to only add direct dependencies to each package and what is used for `test` and `build script` as _dev_dependencies_.
bluefireteam/photo_view,bluefireteam/photo_view