Can't update the package.json file in new repo

[joncodo]

Note: I think this is related to an answer here?: #56

Steps to reproduce

1. Clone the repo and make a change to the package.json file for a new command called "foo: echo foo"
2. ➜ prevent-duplicate-users-test1 git:(master) ✗ ../create-frigg-app/packages/create-frigg-app/index.js prevent-duplicate-users-test2 --template file:../create-frigg-app/packages/cfa-template/
3. This makes a new folder with a new create-frigg-app that I think is required to ensure that the changes are translated over to the consuming programmers.
4. Then I check the files to see if things are the way I expect
5. The command of "echo foo" is not in the package.json