chore: maintenance routine

[aldy505]

What kind of change does this PR introduce? (check at least one)

• Bugfix
• Feature
• Code style update
• Refactor
• Build-related changes
• Other, please describe:

Does this PR introduce a breaking change? (check one)

• Yes
• No

If yes, please describe the impact and migration path for existing applications:

The PR fulfills these requirements:

• When resolving a specific issue, it's referenced in the PR's title (e.g. fix #xxx[,#xxx], where "xxx" is the issue number)
• All tests are passing
• New/updated tests are included

If adding a new feature, the PR's description includes:

• A convincing reason for adding this feature (to avoid wasting your time, it's best to open a suggestion issue first and wait for approval before working on it)

Other information:

[codecov]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (3465c2d) 97.19% compared to head (aa4034f) 96.34%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master       #3      +/-   ##
==========================================
- Coverage   97.19%   96.34%   -0.86%     
==========================================
  Files           6        6              
  Lines         321      410      +89     
==========================================
+ Hits          312      395      +83     
- Misses          6       11       +5     
- Partials        3        4       +1     

Files	Coverage Δ
bcrypt/bcrypt.go	91.89% <100.00%> (-0.97%)	⬇️
pbkdf2/pbkdf2.go	98.11% <100.00%> (+0.46%)	⬆️
scrypt/scrypt.go	92.40% <100.00%> (-0.58%)	⬇️
argon2/argon2.go	95.65% <62.50%> (-2.88%)	⬇️

... and 2 files with indirect coverage changes

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