Proxyquire not in package JSON deps

[matt-oc]

errors when trying to test because not installed

[mcdonnelldean]

@matt-oc Can you add it? Whatever the latest version is, dev-deps only.

[matt-oc]

@mcdonnelldean Thats was done in the PR you just merged but it was in deps, made a new one putting in dev deps now.