chore: make libp2p-crypto a dev dep

[achingbrain]

It's only used to verify incoming message payloads but the pubKey property on PeerId can do that.

[dapplion]

Makes sense! Agree with the change. However should we keep both the package-lock.json and yarn.lock?

[achingbrain]

should we keep both the package-lock.json and yarn.lock?

Ha! Oops. I've removed the newly added package-lock.json file.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.13%. Comparing base (735f287) to head (a48294c).
⚠️ Report is 217 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #115      +/-   ##
==========================================
- Coverage   89.13%   89.13%   -0.01%     
==========================================
  Files          16       16              
  Lines        1832     1831       -1     
  Branches      243      243              
==========================================
- Hits         1633     1632       -1     
  Misses        199      199              

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