Round naturaldelta to the nearest

[hugovk]

Fixes #143.

Changes proposed in this pull request:

• Round naturaldelta to the nearest
• Leave naturaltime rounding down

[codecov-commenter]

Codecov Report

Merging #154 into master will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #154   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            9         9           
  Lines          556       568   +12     
=========================================
+ Hits           556       568   +12     

Flag	Coverage Δ
#GHA_Ubuntu	100.00% <100.00%> (ø)
#GHA_Windows	100.00% <100.00%> (ø)
#GHA_macOS	100.00% <100.00%> (ø)

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Impacted Files	Coverage Δ
src/humanize/i18n.py	100.00% <ø> (ø)
src/humanize/time.py	100.00% <100.00%> (ø)
tests/test_time.py	100.00% <100.00%> (ø)

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[hugovk]

This PR is a bit stale I think it would need more refactoring. I'm going to close this, and welcome fresh PRs if someone else would like to work on it.