feat: Allow for token from yaml

[thomasrockhu]

fixes codecov/codecov-action#430
related #222
related #219
related #217

[codecov]

Codecov Report

Merging #227 (a2e5f4f) into master (3e1beda) will increase coverage by 0.20%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #227      +/-   ##
==========================================
+ Coverage   94.43%   94.63%   +0.20%     
==========================================
  Files          22       23       +1     
  Lines         772      801      +29     
  Branches      141      144       +3     
==========================================
+ Hits          729      758      +29     
  Misses         12       12              
  Partials       31       31              

Flag	Coverage Δ
alpine	94.63% <100.00%> (+0.20%)	⬆️
linux	94.63% <100.00%> (+0.20%)	⬆️
linux-without-git	94.63% <100.00%> (+0.20%)	⬆️
macos	94.63% <100.00%> (+0.20%)	⬆️
macos-without-git	94.63% <100.00%> (+0.20%)	⬆️
windows	94.00% <100.00%> (+0.22%)	⬆️
windows-without-git	94.00% <100.00%> (+0.22%)	⬆️

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Impacted Files	Coverage Δ
src/helpers/files.js	94.36% <100.00%> (ø)
src/helpers/token.js	100.00% <100.00%> (ø)
src/index.js	84.70% <100.00%> (+0.18%)	⬆️

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