colors dependecy attack through prettyjson

[t1bb4r]

Issue:
Install run-rs in a new project would result in installing malicious package, colors > 1.4.0 (Causing infinite loop prints on your system).

Solution:
The issue has already been reported and fixed in prettyjson, a new version has not yet been published to npm.
rafeca/prettyjson#54

Once published please update prettyjson to 1.2.2 (or whatever tag will be used).

Temporary workaround:
add colors as a top level dependency npm install colors@1.4.0.

Thanks:
run-rs is awesome and a crucial part of testing in multiple projects I work on. Thank you so much @vkarpov15 for all your hard work on this!