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

Merging #115 (a48294c) into master (735f287) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            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              

Impacted Files	Coverage Δ
src/utils.ts	98.40% <100.00%> (-0.02%)	⬇️

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