fix: add Token flowtype declarations

[mvines]

No description provided.

[codecov-io]

Codecov Report

Merging #26 into dev will decrease coverage by 4.21%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##              dev      #26      +/-   ##
==========================================
- Coverage   92.17%   87.96%   -4.22%     
==========================================
  Files          12       14       +2     
  Lines         358      374      +16     
  Branches       39       39              
==========================================
- Hits          330      329       -1     
- Misses         28       45      +17

Impacted Files	Coverage Δ
src/system-program.js	100% <ø> (+27.77%)	⬆️
src/token-program.js	90% <ø> (ø)	⬆️
src/connection.js	88.5% <ø> (ø)	⬆️
src/native-loader.js	0% <0%> (ø)
src/loader.js	0% <0%> (ø)
src/budget-program.js	96.66% <0%> (-1.12%)	⬇️

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[mvines]

🎉 This PR is included in version 0.5.3 🎉

The release is available on:

• npm package (@dev dist-tag)
• GitHub release

Your semantic-release bot 📦🚀

[github-actions]

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