fix(package): add chalk to peerDeps

[shellscape]

What kind of change does this PR introduce?

package.json change to fix an issue with chalk not being a peerDep

Did you add tests for your changes?

No need

Summary

peerDeps are like, so cool. Fixes #291

Does this PR introduce a breaking change?

No

Other information

[codecov]

Codecov Report

Merging #292 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #292   +/-   ##
=======================================
  Coverage   96.81%   96.81%           
=======================================
  Files           7        7           
  Lines         251      251           
=======================================
  Hits          243      243           
  Misses          8        8

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