Bump version of hawk dep.

Hawk used to be locked to node 8 and below.
This was fixed in the 1.1.1 release:
https://github.com/hueniverse/hawk/commit/a523a412afbda2eca1fb1d253b8e3511fdbd371d
Merge pull request #927 from samccone/sjs/bump-hawk

Bump version of hawk dep.