Update package definitions

[Ethan-Arrowood]

Description

This PR updates the dev dependencies and generates a new package-lock.json file for Travis to use in npm ci. It should remedy error in PR #8. Closes #11 #12

Used to be #14 -- renamed branch for better version control

Checklist for success

• [x] This change isn't already implemented by a pending pull request
• [x] This change is a child commit of a reasonably recent commit in the master branch
  • Requests need not be a single commit, but should be a linear sequence of commits (i.e. no merge commits in your PR)
• [x] All tests pass locally (see the testing section for more info)
• [x] All New behaviors or major functional changes have tests

[bengreenier]

actually - this closes #11 and #12, right? please make sure you tag 11!