Fix pub key encoding hex value not properly converted to string

[yknl]

Fix pub key encoding hex value not properly converted to string for sig hash.

Potential fix for #58

Type of Change

• [ ] New feature
• [x] Bug fix
• [ ] API reference/documentation update
• [ ] Other

Does this introduce a breaking change?

No

Are documentation updates required?

No

Testing information

Transaction generation should now work in browsers

For detailed steps to reproduce, see #58

Checklist

• [x] Code is commented where needed
• [x] Unit test coverage for new or modified code paths
• [x] npm run test passes
• [ ] Changelog is updated
• [ ] Tag 1 of @yknl, @zone117x, @reedrosenbluth for review

[codecov[bot]]

Codecov Report

Merging #66 into master will increase coverage by 0.07%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #66      +/-   ##
==========================================
+ Coverage   87.13%   87.20%   +0.07%     
==========================================
  Files          25       25              
  Lines        1321     1321              
  Branches      238      238              
==========================================
+ Hits         1151     1152       +1     
+ Misses        169      168       -1     
  Partials        1        1              

Impacted Files	Coverage Δ
src/authorization.ts	76.43% <100.00%> (ø)
src/utils.ts	73.43% <0.00%> (+1.56%)	:arrow_up:

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