update test tool dependencies
update test tool dependencies

Summary:
Code coverage was not working. Things seem to work with updated dependencies.
You can now get code coverage (not including examples) by running:

npm run coverage

Reviewers: benchan

Reviewed By: benchan

Subscribers: ben

Differential Revision: https://phabricator.bitgo.com/D942

BitGo/BitGoJS,BitGo/BitGoJS,BitGo/BitGoJS,BitGo/BitGoJS