do using of at-required packages relative

[oxinabox]

I believe this should solve #115

From the Requires.jl readme:

In the @require block, or any included files, you can use or import the package, but note that you must use the syntax using .Gadfly or import .Gadfly, rather than the usual syntax. Otherwise you will get a warning about Gadfly not being in dependencies.

[nickrobinson251]

Have you verified this works (locally)?

[oxinabox]

It does not.
I think I need an extra .

[oxinabox]

verified properly: it doesn't give that warning anymore.
And also it doesn't just error.

[nickrobinson251]

Once verified locally and CI passes, go ahead and merge