fix(duration): accepts fractional values for duration

[fredbi]

• fixes Unexpected results from the duration format #169

[codecov]

Codecov Report

❌ Patch coverage is 86.66667% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 82.86%. Comparing base (25d4e0a) to head (996bdcd).
⚠️ Report is 4 commits behind head on master.

Files with missing lines	Patch %	Lines
duration.go	86.66%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #170      +/-   ##
==========================================
- Coverage   82.87%   82.86%   -0.02%     
==========================================
  Files          13       13              
  Lines        2178     2188      +10     
==========================================
+ Hits         1805     1813       +8     
- Misses        295      296       +1     
- Partials       78       79       +1     

Flag	Coverage Δ
oldstable-macos-latest	82.86% <86.66%> (-0.02%)	⬇️
oldstable-ubuntu-latest	82.86% <86.66%> (-0.02%)	⬇️
oldstable-windows-latest	82.86% <86.66%> (-0.02%)	⬇️
stable-macos-latest	82.86% <86.66%> (-0.02%)	⬇️
stable-ubuntu-latest	82.86% <86.66%> (-0.02%)	⬇️
stable-windows-latest	82.86% <86.66%> (-0.02%)	⬇️

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