Update CONTRIBUTING.md (#2649)
* Updating node version in contributing.md docs
* Update CONTRIBUTING.md
Co-authored-by: Robert Snow <snowystinger@gmail.com>
Co-authored-by: Justin Skinner <jskinner@adobe.com>
Co-authored-by: Robert Snow <snowystinger@gmail.com>
Co-authored-by: Danni <drobinson@livefyre.com>
Co-authored-by: Robert Snow <rsnow@adobe.com>
Co-authored-by: Daniel Lu <dlu@livefyre.com>
