fix example in the readme

[thomas-fossati]

VerifyP256 creates a new verifier for ES512

[codecov[bot]]

Codecov Report

Merging #114 (662a70b) into main (77e3f9f) will increase coverage by 0.30%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #114      +/-   ##
==========================================
+ Coverage   91.79%   92.10%   +0.30%     
==========================================
  Files          10       10              
  Lines         975      975              
==========================================
+ Hits          895      898       +3     
+ Misses         54       51       -3     
  Partials       26       26              

Impacted Files	Coverage Δ
cbor.go	84.21% <100.00%> (ø)
headers.go	93.05% <0.00%> (+0.90%)	:arrow_up:

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